Question

Find the number of ways of putting five distinct rings on four fingers of the left hand.

Answer 1

The no. of ways of putting five distinct rings on four fingers of the left hand are 120.

Hint:
ways to put ring on first finger =5
ways to put ring on 2nd finger =4
ways to put ring on 3rd finger = 3
ways to put ring on 4th finger = 2

So, total no of ways=
5×4×3×2
=120