The number of selections of 2 candidate for a post out of 5 equally qualified candidates.
P ( 5, 2 )
5 !
( 5 - 2 ) !
10
How many 10 digits number can be written by using the digits 1 and 2.
10 C1 +9 C2
2 10
10C1
10 !
The number of ways in which 9 studnets can be equally distributed among 3 sections is ________.
9!
None of these
The number of ways in which 5 women, can draw water from 5 taps, no tap remaining unused is _______.
5 x 5
52
The number of lines drawn through 6 points lying on a circle is ______
12
15
24
30
How many different arrangements can be made out of the letters in the expansion A2 B3 C4, when written in full ?
2! + 3! + 4!
2 ! 3!
If npr = 720 ncr, then r is equal to _________.
6
5
4
7
The possible out comes when a coin is tossed five times.
25
5/2
The number of ways in which 21 objects can be grouped into three groups 8,7 and 6 objects is _____
The number of ways in which 6 red roses and 3 white roses can form a garland so that all the white roses come together is _______.
2170
2165
2160
2155