Advertisements
Advertisements
Question
A bag contains 4 red, 5 black and 6 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is:
red
Advertisements
Solution
\[\text{ Number of red balls }= 4\]
\[\text{ Number of black balls } = 5\]
\[\text{ Number of white balls }= 6\]
\[\text{ Total number of balls in the bag }= 4 + 5 + 6 = 15\]
\[\text{ Therefore, the total number of cases is 15 }. \]
\[\text{ Let B denote the event of getting a red ball }. \]
\[\text{ Number of favourable out comes,i.e. number of red balls 4 }\]
\[P\left( B \right) = \frac{\text{ Number of favourable outcomes }}{\text{ Total number of outcomes }} = \frac{4}{15}\]
RELATED QUESTIONS
List the outcomes you can see in this experiment.
Tossing two coins together
A coin is flipped to decide which team starts the game. What is the probability that your team will start?
A box contains pairs of socks of two colours (black and white). I have picked out a white sock. I pick out one more with my eyes closed. What is the probability that it will make a pair?
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:
an even number on one and a multiple of 3 on the other
A bag contains 5 red marbles, 8 white marbles, 4 green marbles. What is the probability that if one marble is taken out of the bag at random, it will be
red
There are 2 aces in each of the given set of cards placed face down. From which set are you certain to pick the two aces in the first go?
Following cards are put facing down:
\[\boxed{\text{A}}\] \[\boxed{\text{E}}\] \[\boxed{\text{I}}\] \[\boxed{\text{O}}\] \[\boxed{\text{U}}\]
What is the chance of drawing out
- a vowel
- a card marked U
- A or I
- a consonant
What is the probability of the sun setting tomorrow?
What is the probability that a student chosen at random out of 3 girls and 4 boys is a boy?
