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
If nC3 = nC2 then the value of nC4 is:
The value of (5C0 + 5C1) + (5C1 + 5C2) + (5C2 + 5C3) + (5C3 + 5C4) + (5C4 + 5C5) is:
A Kabaddi coach has 14 players ready to play. How many different teams of 7 players could the coach put on the court?
In a parking lot one hundred, one-year-old cars, are parked. Out of them five are to be chosen at random for to check its pollution devices. How many different set of five cars can be chosen?
7 relatives of a man comprises 4 ladies and 3 gentlemen, his wife also has 7 relatives; 3 of them are ladies and 4 gentlemen. In how many ways can they invite a dinner party of 3 ladies and 3 gentlemen so that there are 3 of man’s relative and 3 of the wife’ s relatives?
There are 11 points in a plane. No three of these lie in the same straight line except 4 points which are collinear. Find the number of triangles that can be formed for which the points are their vertices?
Choose the correct alternative:
The number of ways in which a host lady invite 8 people for a party of 8 out of 12 people of whom two do not want to attend the party together is
Choose the correct alternative:
Number of sides of a polygon having 44 diagonals is ______
Choose the correct alternative:
In 2nC3 : nC3 = 11 : 1 then
Choose the correct alternative:
`""^(("n" - 1))"C"_"r" + ""^(("n" - 1))"C"_(("r" - 1))` is
