P, Q, R, S are to give lectures to an audience. The organizer can arrange the order of their presentation in ______.
4 ways
12 ways
256 ways
24 ways
The number of selections of 2 candidate for a post out of 5 equally qualified candidates.
P ( 5, 2 )
5 !
( 5 - 2 ) !
10
In how ways can 18 different books be divided equally among 3 students?
18!
18!/(6!)2
18!/(6!)3
18!/6!
The number of distinct positive divisors of 22 32 53 is _______.
25
36
72
144
There are four letter boxes in a post office. In how many ways can a man post 8 distinct letters.
8 x 8
84
4 8
8 p 4
In how many ways can 7 toys be given away to 3 children when each child is eligible for all the toys ?
3570
4350
2187
2426
The number of diagonals that can be drawn by joining the angular points of a polygon of 20 sides are
190
210
20
170
How many triangles can be formed by joining the vertices of an n-sided polygon?
nC2
nCn
nC3
nC5
The number of ways in which 5 women, can draw water from 5 taps, no tap remaining unused is _______.
5 x 5
52
None of these
If npr = 720 ncr, then r is equal to _________.
6
5
4
7
