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

None of these

Verified by Experts

The correct Answer is:

A

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