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Find the total number of permutations of...

Find the total number of permutations of `n` different things taken not more than `r` at a time, when each thing may be repeated any number of times.

A

`(n^r-1)/(n-1)`

B

`r^n -1`

C

`(n(n^r -1))/(n-1)`

D

none of these

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The correct Answer is:
C
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