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?
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
A committee of 5 is to be formed out of 6 gents and 4 ladies. In how many ways this can be done when
- atleast two ladies are included.
- atmost two ladies are included.
The number of parallelograms that can be formed from a set of four parallel lines intersecting another set of three parallel lines is:
Prove that `""^(2"n")"C"_"n" = (2^"n" xx 1 xx 3 xx ... (2"n" - 1))/("n"!)`
There are 15 persons in a party and if each 2 of them shakes hands with each other, how many handshakes happen in the party?
How many different selections of 5 books can be made from 12 different books if, Two particular books are always selected?
Find the number of ways of forming a committee of 5 members out of 7 Indians and 5 Americans, so that always Indians will be the majority in the committee
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:
Number of sides of a polygon having 44 diagonals is ______
Choose the correct alternative:
`""^(("n" - 1))"C"_"r" + ""^(("n" - 1))"C"_(("r" - 1))` is
Choose the correct alternative:
The number of ways of choosing 5 cards out of a deck of 52 cards which include at least one king is
