Question

In how many ways can 5 man draw water from 5 taps if no tap can be ised more than once

Answer 1

1st man can draw water from any of the 5 taps
2nd man can draw water from any of the remaining 4 taps
3rd man can draw water from any of the remaining 3 taps
4th man can draw water from any of the remaining 2 taps
5th man can draw water from remaining 1 tap
54321
Hence total number of ways = 5 x 4 x 3 x 2 x 1 = 120