Advertisements
Advertisements
प्रश्न
Let there be 3 red, 2 yellow and 2 green signal flags. How many different signals are possible if we wish to make signals by arranging all of them vertically on a staff?
Advertisements
उत्तर
We have to arrange totally 7 flags out of which 3 are one kind (Red) 2 are of another kind (yellow) and 2 are of third kind (green)
So, total number of signals = `(7!)/(3! 2! 2!)`
`= (7 xx 6 xx 5 xx 4 xx 3!)/(3! xx 2 xx 2)`
= 7 × 6 × 5 = 210
APPEARS IN
संबंधित प्रश्न
The number of parallelograms that can be formed from a set of four parallel lines intersecting another set of three parallel lines is:
There are 10 true or false questions in an examination. Then these questions can be answered in
A Kabaddi coach has 14 players ready to play. How many different teams of 7 players could the coach put on the court?
How many chords can be drawn through 20 points on a circle?
How many different selections of 5 books can be made from 12 different books if, Two particular books are never selected?
There are 5 teachers and 20 students. Out of them a committee of 2 teachers and 3 students is to be formed. Find the number of ways in which this can be done. Further find in how many of these committees a particular teacher is included?
A committee of 7 peoples has to be formed from 8 men and 4 women. In how many ways can this be done when the committee consists of at most 3 women?
Choose the correct alternative:
If 10 lines are drawn in a plane such that no two of them are parallel and no three are concurrent, then the total number of points of intersection are
Choose the correct alternative:
The number of rectangles that a chessboard has ______
Choose the correct alternative:
The product of first n odd natural numbers equals
