Chapters
Chapter 2: Relations
Chapter 3: Functions
Chapter 4: Measurement of Angles
Chapter 5: Trigonometric Functions
Chapter 6: Graphs of Trigonometric Functions
Chapter 7: Values of Trigonometric function at sum or difference of angles
Chapter 8: Transformation formulae
Chapter 9: Values of Trigonometric function at multiples and submultiples of an angle
Chapter 10: Sine and cosine formulae and their applications
Chapter 11: Trigonometric equations
Chapter 12: Mathematical Induction
Chapter 13: Complex Numbers
Chapter 14: Quadratic Equations
Chapter 15: Linear Inequations
Chapter 16: Permutations
Chapter 17: Combinations
Chapter 18: Binomial Theorem
Chapter 19: Arithmetic Progression
Chapter 20: Geometric Progression
Chapter 21: Some special series
Chapter 22: Brief review of cartesian system of rectangular coordinates
Chapter 23: The straight lines
Chapter 24: The circle
Chapter 25: Parabola
Chapter 26: Ellipse
Chapter 27: Hyperbola
Chapter 28: Introduction to three dimensional coordinate geometry
Chapter 29: Limits
Chapter 30: Derivatives
Chapter 31: Mathematical reasoning
Chapter 32: Statistics
Chapter 33: Probability
Chapter 33: Probability
33.1 [Pages 6  7]
RD Sharma solutions for Class 11 Mathematics Textbook Chapter 33 Probability 33.1 [Pages 6  7]
A coin is tossed once. Write its sample space
If a coin is tossed two times, describe the sample space associated to this experiment.
If a coin is tossed three times (or three coins are tossed together), then describe the sample space for this experiment.
Write the sample space for the experiment of tossing a coin four times.
Two dice are thrown. Describe the sample space of this experiment.
What is the total number of elementary events associated to the random experiment of throwing three dice together?
A coin is tossed and then a die is thrown. Describe the sample space for this experiment.
A coin is tossed and then a die is rolled only in case a head is shown on the coin. Describe the sample space for this experiment.
A coin is tossed twice. If the second throw results in a tail, a die is thrown. Describe the sample space for this experiment.
An experiment consists of tossing a coin and then tossing it second time if head occurs. If a tail occurs on the first toss, then a die is tossed once. Find the sample space.
A coin is tossed. If it shows tail, we draw a ball from a box which contains 2 red 3 black balls; if it shows head, we throw a die. Find the sample space of this experiment.
A coin is tossed repeatedly until a tail comes up for the first time. Write the sample space for this experiment.
A box contains 1 red and 3 black balls. Two balls are drawn at random in succession without replacement. Write the sample space for this experiment.
A pair of dice is rolled. If the outcome is a doublet, a coin is tossed. Determine the total number of elementary events associated to this experiment.
A coin is tossed twice. If the second draw results in a head, a die is rolled. Write the sample space for this experiment.
A bag contains 4 identical red balls and 3 identical black balls. The experiment consists of drawing one ball, then putting it into the bag and again drawing a ball. What are the possible outcomes of the experiment?
In a random sampling three items are selected from a lot. Each item is tested and classified as defective (D) or nondefective (N). Write the sample space of this experiment.
An experiment consists of boygirl composition of families with 2 children.
What is the sample space if we are interested in knowing whether it is a boy or girl in the order of their births?
An experiment consists of boygirl composition of families with 2 children.
What is the sample space if we are interested in the number of boys in a family?
There are three coloured dice of red, white and black colour. These dice are placed in a bag. One die is drawn at random from the bag and rolled its colour and the number on its uppermost face is noted. Describe the sample space for this experiment.
2 boys and 2 girls are in room P and 1 boy 3 girls are in room Q. Write the sample space for the experiment in which a room is selected and then a person.
A bag contains one white and one red ball. A ball is drawn from the bag. If the ball drawn is white it is replaced in the bag and again a ball is drawn. Otherwise, a die is tossed. Write the sample space for this experiment.
A box contains 1 white and 3 identical black balls. Two balls are drawn at random in succession without replacement. Write the sample space for this experiment.
An experiment consists of rolling a die and then tossing a coin once if the number on the die is even. If the number on the die is odd, the coin is tossed twice. Write the sample space for this experiment.
A die is thrown repeatedly until a six comes up. What is the sample space for this experiment.
33.2 [Pages 15  16]
RD Sharma solutions for Class 11 Mathematics Textbook Chapter 33 Probability 33.2 [Pages 15  16]
A coin is tossed. Find the total number of elementary events and also the total number events associated with the random experiment.
List all events associated with the random experiment of tossing of two coins. How many of them are elementary events.
Three coins are tossed once. Describe the events associated with this random experiment:
A = Getting three heads
B = Getting two heads and one tail
C = Getting three tails
D = Getting a head on the first coin.
(i) Which pairs of events are mutually exclusive?
Three coins are tossed once. Describe the events associated with this random experiment:
A = Getting three heads
B = Getting two heads and one tail
C = Getting three tails
D = Getting a head on the first coin.
(ii) Which events are elementary events?
Three coins are tossed once. Describe the events associated with this random experiment:
A = Getting three heads
B = Getting two heads and one tail
C = Getting three tails
D = Getting a head on the first coin.
(iii) Which events are compound events?
In a single throw of a die describe the event:
A = Getting a number less than 7
In a single throw of a die describe the event:
B = Getting a number greater than 7
In a single throw of a die describe the event:
C = Getting a multiple of 3
In a single throw of a die describe the event:
D = Getting a number less than 4
In a single throw of a die describe the event:
E = Getting an even number greater than 4
In a single throw of a die describe the event:
F = Getting a number not less than 3.
Also, find A ∪ B, A ∩ B, B ∩ C, E ∩ F, D ∩ F and \[ \bar { F } \] .
Three coins are tossed. Describe. two events A and B which are mutually exclusive.
Three coins are tossed. Describe. three events A, B and C which are mutually exclusive and exhaustive.
Three coins are tossed. Describe. two events A and B which are not mutually exclusive.
Three coins are tossed. Describe.
(iv) two events A and B which are mutually exclusive but not exhaustive.
A die is thrown twice. Each time the number appearing on it is recorded. Describe the following events:
A = Both numbers are odd.
B = Both numbers are even.
C = sum of the numbers is less than 6
Also, find A ∪ B, A ∩ B, A ∪ C, A ∩ C
Which pairs of events are mutually exclusive?
Two dice are thrown. The events A, B, C, D, E and F are described as :
A = Getting an even number on the first die.
B = Getting an odd number on the first die.
C = Getting at most 5 as sum of the numbers on the two dice.
D = Getting the sum of the numbers on the dice greater than 5 but less than 10.
E = Getting at least 10 as the sum of the numbers on the dice.
F = Getting an odd number on one of the dice.
Describe the event:
A and B, B or C, B and C, A and E, A or F, A and F
Two dice are thrown. The events A, B, C, D, E and F are described as :
A = Getting an even number on the first die.
B = Getting an odd number on the first die.
C = Getting at most 5 as sum of the numbers on the two dice.
D = Getting the sum of the numbers on the dice greater than 5 but less than 10.
E = Getting at least 10 as the sum of the numbers on the dice.
F = Getting an odd number on one of the dice.
State true or false:
(a) A and B are mutually exclusive.
(b) A and B are mutually exclusive and exhaustive events.
(c) A and C are mutually exclusive events.
(d) C and D are mutually exclusive and exhaustive events.
(e) C, D and E are mutually exclusive and exhaustive events.
(f) A' and B' are mutually exclusive events.
(g) A, B, F are mutually exclusive and exhaustive events.
The numbers 1, 2, 3 and 4 are written separately on four slips of paper. The slips are then put in a box and mixed thoroughly. A person draws two slips from the box, one after the other, without replacement. Describe the following events:
A = The number on the first slip is larger than the one on the second slip.
B = The number on the second slip is greater than 2
C = The sum of the numbers on the two slips is 6 or 7
D = The number on the second slips is twice that on the first slip.
Which pair(s) of events is (are) mutually exclusive?
A card is picked up from a deck of 52 playing cards.
What is the sample space of the experiment?
A card is picked up from a deck of 52 playing cards.
What is the event that the chosen card is a black faced card?
33.3 [Pages 45  48]
RD Sharma solutions for Class 11 Mathematics Textbook Chapter 33 Probability 33.3 [Pages 45  48]
A dice is thrown. Find the probability of getting a prime number
A dice is thrown. Find the probability of getting:
2 or 4
A dice is thrown. Find the probability of getting a multiple of 2 or 3.
In a simultaneous throw of a pair of dice, find the probability of getting:
8 as the sum
In a simultaneous throw of a pair of dice, find the probability of getting a doublet
In a simultaneous throw of a pair of dice, find the probability of getting a doublet of prime numbers
In a simultaneous throw of a pair of dice, find the probability of getting a doublet of odd numbers
In a simultaneous throw of a pair of dice, find the probability of getting a sum greater than 9
In a simultaneous throw of a pair of dice, find the probability of getting an even number on first
In a simultaneous throw of a pair of dice, find the probability of getting an even number on one and a multiple of 3 on the other
In a simultaneous throw of a pair of dice, find the probability of getting neither 9 nor 11 as the sum of the numbers on the faces
In a simultaneous throw of a pair of dice, find the probability of getting a sum more than 6
In a simultaneous throw of a pair of dice, find the probability of getting a sum less than 7
In a simultaneous throw of a pair of dice, find the probability of getting a sum more than 7
In a simultaneous throw of a pair of dice, find the probability of getting neither a doublet nor a total of 10
In a simultaneous throw of a pair of dice, find the probability of getting odd number on the first and 6 on the second
In a simultaneous throw of a pair of dice, find the probability of getting a number greater than 4 on each die
In a simultaneous throw of a pair of dice, find the probability of getting a total of 9 or 11
In a simultaneous throw of a pair of dice, find the probability of getting a total greater than 8.
In a single throw of three dice, find the probability of getting a total of 17 or 18.
Three coins are tossed together. Find the probability of getting exactly two heads
Three coins are tossed together. Find the probability of getting at least two heads
Three coins are tossed together. Find the probability of getting at least one head and one tail.
What is the probability that an ordinary year has 53 Sundays?
What is the probability that a leap year has 53 Sundays and 53 Mondays?
A and B throw a pair of dice. If A throws 9, find B's chance of throwing a higher number.
Two unbiased dice are thrown. Find the probability that the total of the numbers on the dice is greater than 10.
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is a black king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is either a black card or a king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is black and a king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is a jack, queen or a king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is neither a heart nor a king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is spade or an ace
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is neither an ace nor a king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is a diamond card
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is not a diamond card
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is a black card
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is not an ace
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is not a black card.
In shuffling a pack of 52 playing cards, four are accidently dropped; find the chance that the missing cards should be one from each suit.
From a deck of 52 cards, four cards are drawn simultaneously, find the chance that they will be the four honours of the same suit.
Tickets numbered from 1 to 20 are mixed up together and then a ticket is drawn at random. What is the probability that the ticket has a number which is a multiple of 3 or 7?
A bag contains 6 red, 4 white and 8 blue balls. if three balls are drawn at random, find the probability that one is red, one is white and one is blue.
A bag contains 7 white, 5 black and 4 red balls. If two balls are drawn at random, find the probability that both the balls are white
A bag contains 7 white, 5 black and 4 red balls. If two balls are drawn at random, find the probability that one ball is black and the other red
A bag contains 7 white, 5 black and 4 red balls. If two balls are drawn at random, find the probability that both the balls are of the same colour.
A bag contains 6 red, 4 white and 8 blue balls. If three balls are drawn at random, find the probability that one is red and two are white
A bag contains 6 red, 4 white and 8 blue balls. If three balls are drawn at random, find the probability that two are blue and one is red
A bag contains 6 red, 4 white and 8 blue balls. If three balls are drawn at random, find the probability that one is red
Five cards are drawn from a pack of 52 cards. What is the chance that these 5 will contain at least one ace?
Five cards are drawn from a pack of 52 cards. What is the chance that these 5 will contain at least one ace?
The face cards are removed from a full pack. Out of the remaining 40 cards, 4 are drawn at random. what is the probability that they belong to different suits?
In a hand at Whist, what is the probability that four kings are held by a specified player?
There are four men and six women on the city councils. If one council member is selected for a committee at random, how likely is that it is a women?
Find the probability that in a random arrangement of the letters of the word 'SOCIAL' vowels come together.
The letters of the word' CLIFTON' are placed at random in a row. What is the chance that two vowels come together?
The letters of the word 'FORTUNATES' are arranged at random in a row. What is the chance that the two 'T' come together.
Find the probability that in a random arrangement of the letters of the word 'UNIVERSITY', the two I's do not come together.
A committee of two persons is selected from two men and two women. What is the probability that the committee will have no man?
A committee of two persons is selected from two men and two women. What is the probability that the committee will have one man?
A committee of two persons is selected from two men and two women. What is the probability that the committee will have two men?
If odds against an event be 7 : 9, find the probability of nonoccurrence of this event.
Two balls are drawn at random from a bag containing 2 white, 3 red, 5 green and 4 black balls, one by one without, replacement. Find the probability that both the balls are of different colours.
Two unbiased dice are thrown. Find the probability that neither a doublet nor a total of 8 will appear
Two unbiased dice are thrown. Find the probability that the sum of the numbers obtained on the two dice is neither a multiple of 2 nor a multiple of 3
A bag contains 8 red, 3 white and 9 blue balls. If three balls are drawn at random, determine the probability that all the three balls are blue balls
A bag contains 8 red, 3 white and 9 blue balls. If three balls are drawn at random, determine the probability that all the balls are of different colours.
A bag contains 5 red, 6 white and 7 black balls. Two balls are drawn at random. What is the probability that both balls are red or both are black?
If a letter is chosen at random from the English alphabet, find the probability that the letter is a vowel .
If a letter is chosen at random from the English alphabet, find the probability that the letter is a consonant .
In a lottery, a person chooses six different numbers at random from 1 to 20, and if these six numbers match with six number already fixed by the lottery committee, he wins the prize. What is the probability of winning the prize in the game?
20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the cards is a multiple of 4?
20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the cards is not a multiple of 4?
20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the cards is odd?
20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the cards is greater than 12?
20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the cards is divisible by 5?
20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the cards is not a multiple of 6?
Two dice are thrown. Find the odds in favour of getting the sum 4.
Two dice are thrown. Find the odds in favour of getting the sum 5.
Two dice are thrown. Find the odds in favour of getting the sum What are the odds against getting the sum 6?
What are the odds in favour of getting a spade if the card drawn from a wellshuffled deck of cards? What are the odds in favour of getting a king?
A box contains 10 red marbles, 20 blue marbles and 30 green marbles. 5 marbles are drawn at random. From the box, what is the probability that all are blue?
A box contains 10 red marbles, 20 blue marbles and 30 green marbles. 5 marbles are drawn at random. From the box, what is the probability that at least one is green?
A box contains 6 red marbles numbered 1 through 6 and 4 white marbles numbered from 12 through 15. Find the probability that a marble drawn is white .
A box contains 6 red marbles numbered 1 through 6 and 4 white marbles numbered from 12 through 15. Find the probability that a marble drawn is white and odd numbered .
A box contains 6 red marbles numbered 1 through 6 and 4 white marbles numbered from 12 through 15. Find the probability that a marble drawn is even numbered
A box contains 6 red marbles numbered 1 through 6 and 4 white marbles numbered from 12 through 15. Find the probability that a marble drawn is red or even numbered.
A class consists of 10 boys and 8 girls. Three students are selected at random. What is the probability that the selected group has all boys?
A class consists of 10 boys and 8 girls. Three students are selected at random. What is the probability that the selected group has all girls?
A class consists of 10 boys and 8 girls. Three students are selected at random. What is the probability that the selected group has 1 boys and 2 girls?
A class consists of 10 boys and 8 girls. Three students are selected at random. What is the probability that the selected group has at least one girl?
A class consists of 10 boys and 8 girls. Three students are selected at random. What is the probability that the selected group has at most one girl?
Five cards are drawn from a wellshuffled pack of 52 cards. Find the probability that all the five cards are hearts.
A bag contains tickets numbered from 1 to 20. Two tickets are drawn. Find the probability that both the tickets have prime numbers on them
A bag contains tickets numbered from 1 to 20. Two tickets are drawn. Find the probability that on one there is a prime number and on the other there is a multiple of 4.as
An urn contains 7 white, 5 black and 3 red balls. Two balls are drawn at random. Find the probability that both the balls are red .
An urn contains 7 white, 5 black and 3 red balls. Two balls are drawn at random. Find the probability that one ball is red and the other is black
An urn contains 7 white, 5 black and 3 red balls. Two balls are drawn at random. Find the probability that one ball is white.
Which of the cannot be valid assignment of probability for elementary events or outcomes of sample space S = {w_{1}, w_{2}, w_{3}, w_{4}, w_{5}, w_{6}, w_{7}}:
Elementary events:  w_{1}  w_{2}  w_{3}  w_{4}  w_{5}  w_{6}  w_{7} 
(i)  0.1  0.01  0.05  0.03  0.01  0.2  0.6 
Which of the cannot be valid assignment of probability for elementary events or outcomes of sample space S = {w_{1}, w_{2}, w_{3}, w_{4}, w_{5}, w_{6}, w_{7}}:
Elementary events:  w_{1}  w_{2}  w_{3}  w_{4}  w_{5}  w_{6}  w_{7} 
(ii) 
\[\frac{1}{7}\]

\[\frac{1}{7}\]

\[\frac{1}{7}\]

\[\frac{1}{7}\]

\[\frac{1}{7}\]

\[\frac{1}{7}\]

\[\frac{1}{7}\]

Which of the cannot be valid assignment of probability for elementary events or outcomes of sample space S = {w_{1}, w_{2}, w_{3}, w_{4}, w_{5}, w_{6}, w_{7}}:
Elementary events:  w_{1}  w_{2}  w_{3}  w_{4}  w_{5}  w_{6}  w_{7} 
(iii)  0.7  0.06  0.05  0.04  0.03  0.2  0.1 
Which of the cannot be valid assignment of probability for elementary events or outcomes of sample space S = {w_{1}, w_{2}, w_{3}, w_{4}, w_{5}, w_{6}, w_{7}}:
Elementary events:  w_{1}  w_{2}  w_{3}  w_{4}  w_{5}  w_{6}  w_{7} 
(iv) 
\[\frac{1}{14}\]

\[\frac{2}{14}\]

\[\frac{3}{14}\]

\[\frac{4}{14}\]

\[\frac{5}{14}\]

\[\frac{6}{14}\]

\[\frac{15}{14}\]

In a single throw of three dice, find the probability of getting the same number on all the three dice.
A box contains 100 bulbs, 20 of which are defective. 10 bulbs are selected for inspection. Find the probability that: all 10 are defective
A box contains 100 bulbs, 20 of which are defective. 10 bulbs are selected for inspection. Find the probability that all 10 are good
A box contains 100 bulbs, 20 of which are defective. 10 bulbs are selected for inspection. Find the probability thatat least one is defective
A box contains 100 bulbs, 20 of which are defective. 10 bulbs are selected for inspection. Find the probability that none is defective
If odds in favour of an event be 2 : 3, find the probability of occurrence of this event.
33.4 [Pages 67  69]
RD Sharma solutions for Class 11 Mathematics Textbook Chapter 33 Probability 33.4 [Pages 67  69]
If A and B be mutually exclusive events associated with a random experiment such that P(A) = 0.4 and P(B) = 0.5, then find
P (A ∪ B)
If A and B be mutually exclusive events associated with a random experiment such that P(A) = 0.4 and P(B) = 0.5, then find
\[P (\bar{ A } \cap \bar{ B} )\]
If A and B be mutually exclusive events associated with a random experiment such that P(A) = 0.4 and P(B) = 0.5, then find
P ( \[\bar{ A} \] ∩ B)
If A and B be mutually exclusive events associated with a random experiment such that P(A) = 0.4 and P(B) = 0.5, then find
P (A ∩\[\bar{ B } \] ).
A and B are two events such that P (A) = 0.54, P (B) = 0.69 and P (A ∩ B) = 0.35. Find
P (A ∪ B)
A and B are two events such that P (A) = 0.54, P (B) = 0.69 and P (A ∩ B) = 0.35. Find
\[P (\bar{ A } \cap \bar{ B } )\]
A and B are two events such that P (A) = 0.54, P (B) = 0.69 and P (A ∩ B) = 0.35. Find
P (A ∩ \[\bar{ B } \] )
A and B are two events such that P (A) = 0.54, P (B) = 0.69 and P (A ∩ B) = 0.35. Find
P (B ∩ \[\bar{ A } \] )
Fill in the blank in the table:
P (A)  P (B)  P (A ∩ B)  P(A∪ B) 
\[\frac{1}{3}\]  \[\frac{1}{5}\]  \[\frac{1}{15}\]  ...... 
Fill in the blank in the table:
P (A)  P (B)  P (A ∩ B)  P(A∪ B) 
0.35  ....  0.25  0.6 
Fill in the blank in the table:
P (A)  P (B)  P (A ∩ B)  P(A∪ B) 
0.5  0.35  .....  0.7 
If A and B are two events associated with a random experiment such that P(A) = 0.3, P (B) = 0.4 and P (A ∪ B) = 0.5, find P (A ∩ B).
If A and B are two events associated with a random experiment such that
P(A) = 0.5, P(B) = 0.3 and P (A ∩ B) = 0.2, find P (A ∪ B).
If A and B are two events associated with a random experiment such that
P (A ∪ B) = 0.8, P (A ∩ B) = 0.3 and P \[(\bar{A} )\]= 0.5, find P(B).
Given two mutually exclusive events A and B such that P(A) = 1/2 and P(B) = 1/3, find P(A or B).
There are three events A, B, C one of which must and only one can happen, the odds are 8 to 3 against A, 5 to 2 against B, find the odds against C
One of the two events must happen. Given that the chance of one is twothird of the other, find the odds in favour of the other.
A card is drawn at random from a wellshuffled deck of 52 cards. Find the probability of its being a spade or a king.
In a single throw of two dice, find the probability that neither a doublet nor a total of 9 will appear.
A natural number is chosen at random from amongst first 500. What is the probability that the number so chosen is divisible by 3 or 5?
A dice is thrown twice. What is the probability that at least one of the two throws come up with the number 3?
A card is drawn from a deck of 52 cards. Find the probability of getting an ace or a spade card.
The probability that a student will pass the final examination in both English and Hindi is 0.5 and the probability of passing neither is 0.1. If the probability of passing the English Examination is 0.75. What is the probability of passing the Hindi Examination?
One number is chosen from numbers 1 to 100. Find the probability that it is divisible by 4 or 6?
From a well shuffled deck of 52 cards, 4 cards are drawn at random. What is the probability that all the drawn cards are of the same colour.
100 students appeared for two examination, 60 passed the first, 50 passed the second and 30 passed both. Find the probability that a student selected at random has passed at least one examination.
A box contains 10 white, 6 red and 10 black balls. A ball is drawn at random from the box. What is the probability that the ball drawn is either white or red?
In a race, the odds in favour of horses A, B, C, D are 1 : 3, 1 : 4, 1 : 5 and 1 : 6 respectively. Find probability that one of them wins the race.
The probability that a person will travel by plane is 3/5 and that he will travel by trains is 1/4. What is the probability that he (she) will travel by plane or train?
Two cards are drawn from a well shuffled pack of 52 cards. Find the probability that either both are black or both are kings.
In an entrance test that is graded on the basis of two examinations, the probability of a randomly chosen student passing the first examination is 0.8 and the probability of passing the second examination is 0.7. The probability of passing at least one of them is 0.95. What is the probability of passing both?
A box contains 30 bolts and 40 nuts. Half of the bolts and half of the nuts are rusted. If two items are drawn at random, what is the probability that either both are rusted or both are bolts?
An integer is chosen at random from first 200 positive integers. Find the probability that the integer is divisible by 6 or 8.
Find the probability of getting 2 or 3 tails when a coin is tossed four times.
Suppose an integer from 1 through 1000 is chosen at random, find the probability that the integer is a multiple of 2 or a multiple of 9.
In a large metropolitan area, the probabilities are 0.87, 0.36, 0.30 that a family (randomly chosen for a sample survey) owns a colour television set, a black and white television set, or both kinds of sets. What is the probability that a family owns either any one or both kinds of sets?
If A and B are mutually exclusive events such that P(A) = 0.35 and P(B) = 0.45, find P(A ∪ B)
If A and B are mutually exclusive events such that P(A) = 0.35 and P(B) = 0.45, find P(A ∩ B)
If A and B are mutually exclusive events such that P(A) = 0.35 and P(B) = 0.45, find P(A ∩ \[\bar{ B } \] )
If A and B are mutually exclusive events such that P(A) = 0.35 and P(B) = 0.45, find P(\[\bar{ A } \] ∩ \[\bar{B} \] )
A sample space consists of 9 elementary events E_{1}, E_{2}, E_{3}, ..., E_{9} whose probabilities are
P(E_{1}) = P(E_{2}) = 0.08, P(E_{3}) = P(E_{4}) = P(E_{5}) = 0.1, P(E_{6}) = P(E_{7}) = 0.2, P(E_{8}) = P(E_{9}) = 0.07
Suppose A = {E_{1}, E_{5}, E_{8}}, B = {E_{2}, E_{5}, E_{8}, E_{9}}
Compute P(A), P(B) and P(A ∩ B).
A sample space consists of 9 elementary events E_{1}, E_{2}, E_{3}, ..., E_{9} whose probabilities are
P(E_{1}) = P(E_{2}) = 0.08, P(E_{3}) = P(E_{4}) = P(E_{5}) = 0.1, P(E_{6}) = P(E_{7}) = 0.2, P(E_{8}) = P(E_{9}) = 0.07
Suppose A = {E_{1}, E_{5}, E_{8}}, B = {E_{2}, E_{5}, E_{8}, E_{9}}
Using the addition law of probability, find P(A ∪ B).
A sample space consists of 9 elementary events E_{1}, E_{2}, E_{3}, ..., E_{9} whose probabilities are
P(E_{1}) = P(E_{2}) = 0.08, P(E_{3}) = P(E_{4}) = P(E_{5}) = 0.1, P(E_{6}) = P(E_{7}) = 0.2, P(E_{8}) = P(E_{9}) = 0.07
Suppose A = {E_{1}, E_{5}, E_{8}}, B = {E_{2}, E_{5}, E_{8}, E_{9}}
List the composition of the event A ∪ B, and calculate P(A ∪ B) by addting the probabilities of elementary events.
A sample space consists of 9 elementary events E_{1}, E_{2}, E_{3}, ..., E_{9} whose probabilities are
P(E_{1}) = P(E_{2}) = 0.08, P(E_{3}) = P(E_{4}) = P(E_{5}) = 0.1, P(E_{6}) = P(E_{7}) = 0.2, P(E_{8}) = P(E_{9}) = 0.07
Suppose A = {E_{1}, E_{5}, E_{8}}, B = {E_{2}, E_{5}, E_{8}, E_{9}}
Calculate \[P\left( \bar{ B} \right)\] from P(B), also calculate \[P\left( \bar{ B } \right)\] directly from the elementary events of \[\bar{ B } \] .
[Page 71]
RD Sharma solutions for Class 11 Mathematics Textbook Chapter 33 Probability [Page 71]
n (≥ 3) persons are sitting in a row. Two of them are selected. Write the probability that they are together.
A single letter is selected at random from the word 'PROBABILITY'. What is the probability that it is a vowel?
What is the probability that a leap year will have 53 Fridays or 53 Saturdays?
Three dice are thrown simultaneously. What is the probability of getting 15 as the sum?
If the letters of the word 'MISSISSIPPI' are written down at random in a row, what is the probability that four S's come together.
What is the probability that the 13th days of a randomly chosen month is Friday?
Three of the six vertices of a regular hexagon are chosen at random. What is the probability that the triangle with these vertices is equilateral.
If E and E_{2} are independent evens, write the value of P \[\left( ( E_1 \cup E_2 ) \cap (E \cap E_2 ) \right)\]
If A and B are two independent events such that \[P (A \cap B) = \frac{1}{6}\text{ and } P (A \cap B) = \frac{1}{3},\] then write the values of P (A) and P (B).
[Pages 71  73]
RD Sharma solutions for Class 11 Mathematics Textbook Chapter 33 Probability [Pages 71  73]
One card is drawn from a pack of 52 cards. The probability that it is the card of a king or spade is
1/26
3/26
4/13
3/13
Two dice are thrown together. The probability that at least one will show its digit greater than 3 is
1/4
3/4
1/2
1/8
Two dice are thrown simultaneously. The probability of obtaining a total score of 5 is
1/18
1/12
1/9
none of these
Two dice are thrown simultaneously. The probability of obtaining total score of seven is
5/36
6/36
7/36
8/36
The probability of getting a total of 10 in a single throw of two dices is
1/9
1/12
1/6
5/36
A card is drawn at random from a pack of 100 cards numbered 1 to 100. The probability of drawing a number which is a square is
1/5
2/5
1/10
none of these
A bag contains 3 red, 4 white and 5 blue balls. All balls are different. Two balls are drawn at random. The probability that they are of different colour is
47/66
10/33
1/3
1
Two dice are thrown together. The probability that neither they show equal digits nor the sum of their digits is 9 will be
13/15
13/18
1/9
8/9
Four persons are selected at random out of 3 men, 2 women and 4 children. The probability that there are exactly 2 children in the selection is
11/21
9/21
10/21
none of these
The probabilities of happening of two events A and B are 0.25 and 0.50 respectively. If the probability of happening of A and B together is 0.14, then probability that neither Anor B happens is
0.39
0.25
0.11
none of these
A die is rolled, then the probability that a number 1 or 6 may appear is
2/3
5/6
1/3
1/2
Six boys and six girls sit in a row randomly. The probability that all girls sit together is
1/122
1/112
1/102
1/132
The probabilities of three mutually exclusive events A, B and C are given by 2/3, 1/4 and 1/6 respectively. The statement
is true
is false
nothing can be said
could be either
If \[\frac{(1  3p)}{2}, \frac{(1 + 4p)}{3}, \frac{(1 + p)}{6}\] are the probabilities of three mutually exclusive and exhaustive events, then the set of all values of p is
(0, 1)
(−1/4, 1/3)
(0, 1/3)
(0, ∞)
A pack of cards contains 4 aces, 4 kings, 4 queens and 4 jacks. Two cards are drawn at random. The probability that at least one of them is an ace is
1/5
3/16
9/20
1/9
If three dice are throw simultaneously, then the probability of getting a score of 5 is
5/216
1/6
1/36
none of these
One of the two events must occur. If the chance of one is 2/3 of the other, then odds in favour of the other are
1 : 3
3 : 1
2 : 3
3 : 2
The probability that a leap year will have 53 Fridays or 53 Saturdays is
2/7
3/7
4/7
1/7
A person write 4 letters and addresses 4 envelopes. If the letters are placed in the envelopes at random, then the probability that all letters are not placed in the right envelopes, is
1/4
11/24
15/24
23/24
A and B are two events such that P (A) = 0.25 and P (B) = 0.50. The probability of both happening together is 0.14. The probability of both A and B not happening is
0.39
0.25
0.11
none of these
If the probability of A to fail in an examination is \[\frac{1}{5}\] and that of B is \[\frac{3}{10}\] . Then, the probability that either A or B fails is
1/2
11/25
19/50
none of these
A box contains 10 good articles and 6 defective articles. One item is drawn at random. The probability that it is either good or has a defect, is
64/64
49/64
40/64
24/64
Three integers are chosen at random from the first 20 integers. The probability that their product is even is
2/19
3/29
17/19
4/19
Out of 30 consecutive integers, 2 are chosen at random. The probability that their sum is odd, is
14/29
16/29
15/29
10/29
A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected randomwise, the probability that it is black or red ball is
1/3
1/4
5/12
2/3
Two dice are thrown simultaneously. The probability of getting a pair of aces is
1/36
1/3
1/6
none of these
An urn contains 9 balls two of which are red, three blue and four black. Three balls are drawn at random. The probability that they are of the same colour is
5/84
3/9
3/7
7/17
Five persons entered the lift cabin on the ground floor of an 8 floor house. Suppose that each of them independently and with equal probability can leave the cabin at any floor beginning with the first, then the probability of all 5 persons leaving at different floor is
\[\frac{^{7}{}{P}_5}{7^5}\]
\[\frac{7^5}{^{7}{}{P}_5}\]
\[\frac{6}{^{6}{}{P}_5}\]
\[\frac{^{5}{}{P}_5}{5^5}\]
A box contains 10 good articles and 6 with defects. One item is drawn at random. The probability that it is either good or has a defect is
64/64
49/64
40/64
24/64
A box contains 6 nails and 10 nuts. Half of the nails and half of the nuts are rusted. If one item is chosen at random, the probability that it is rusted or is a nail is
3/16
5/16
11/16
14/16
If S is the sample space and P(A) = \[\frac{1}{3}\] P(B) and S = A ∪ B, where A and B are two mutually exclusive events, then P (A) =
1/4
1/2
3/4
3/8
One mapping is selected at random from all mappings of the set A = {1, 2, 3, ..., n} into itself. The probability that the mapping selected is one to one is
\[\frac{1}{n^n}\]
\[\frac{1}{n!}\]
\[\frac{\left( n  1 \right)!}{n^{n  1}}\]
None of these
If A, B, C are three mutually exclusive and exhaustive events of an experiment such that 3 P(A) = 2 P(B) = P(C), then P(A) is equal to
\[\frac{1}{11}\]
\[\frac{2}{11}\]
\[\frac{5}{11}\]
\[\frac{6}{11}\]
If A and B are mutually exclusive events then
\[P\left( A \right) \leq P\left( B \right)\]
\[P\left( A \right) \geq P\left( B \right)\]
\[P\left( A \right) < P\left( B \right)\]
None of these
If P(A ∪ B) = P(A ∩ B) for any two events A and B, then
P(A) = P(B)
P(A) > P(B)
P(A) < P(B)
None of these
Three numbers are chosen from 1 to 20. The probability that they are not consecutive is
 \[\frac{186}{190}\]
 \[\frac{187}{190}\]
 \[\frac{188}{190}\]
 \[\frac{18}{^{20}{}{C}_3}\]
6 boys and 6 girls sit in a row at random. The probability that all the girls sit together is
 \[\frac{1}{432}\]
 \[\frac{12}{431}\]
 \[\frac{1}{132}\]
None of these
Without repetition of the numbers, four digit numbers are formed with the numbers 0, 2, 3, 5. The probability of such a number divisible by 5 is
\[\frac{1}{5}\]
\[\frac{4}{5}\]
\[\frac{1}{30}\]
\[\frac{5}{9}\]
If the probability for A to fail in an examination is 0.2 and that for B is 0.3, then the probability that either A or B fails is
> 0.5
0.5
≤ 0.5
0
Three digit numbers are formed using the digits 0, 2, 4, 6, 8. A number is chosen at random out of these numbers. What is the probability that this number has the same digits?
 \[\frac{1}{16}\]
 \[\frac{16}{25}\]
 \[\frac{1}{645}\]
 \[\frac{1}{25}\]
Chapter 33: Probability
RD Sharma solutions for Class 11 Mathematics Textbook chapter 33  Probability
RD Sharma solutions for Class 11 Mathematics Textbook chapter 33 (Probability) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, stepbystep solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Class 11 Mathematics Textbook solutions in a manner that help students grasp basic concepts better and faster.
Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. RD Sharma textbook solutions can be a core help for selfstudy and acts as a perfect selfhelp guidance for students.
Concepts covered in Class 11 Mathematics Textbook chapter 33 Probability are Exhaustive Events, Mutually Exclusive Events, Axiomatic Approach to Probability, Probability of 'Not', 'And' and 'Or' Events, Random Experiments, Introduction of Event, Occurrence of an Event, Types of Events, Algebra of Events.
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