There are 3 rings to be worn in 4 fingers with at most in each finger.In how many ways can this be done. (Please give very clear explanation)

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Solution

The explanation is as follows.
The first ring can go to one of the fours. The second ring can go to one of the threes. The third ring can go to one of the twos.
So, it is 4×3×2=24.

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