The value of sum(r=0)^n sum(s=1)^n .^nC5...

The value of `sum_(r=0)^n sum_(s=1)^n .^nC_5 .^sC_r ` is

A

`(3^(n)-1)`

B

`3^(n)-1`

C

`3^(n)`

D

`3(3^(n)-1)`

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The correct Answer is:

A

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