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In how many ways five different rings ca...

In how many ways five different rings can be put on four fingers with at least one ring on each finger?

A

`120`

B

`480`

C

`240`

D

`960`

Text Solution

Verified by Experts

The correct Answer is:
D
Since at least one ring is to be put in each finger. So, we select four rings out of 5 and then they are arranged in fingers. This can be done in `""^(5)C_(4)xx4!` ways. Now, either above the ring already placed on it or below it.
So, the required number of ways `=""^(5)C_(4)xx4!xx4xx2=960`
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