The number of permutations of 25 dissimi...

The number of permutations of 25 dissimilar things taken more than 15 at a time when repetitions are allowed is (not exceeding 25)

A

`25/24(25^(25)-25^(15))`

B

`25/24(25^(25)-25^(10))`

C

`25/24(25^(25)+25^(15))`

D

`25/24(25^(25)+25^(10))`

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The correct Answer is:

A

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