The valur of sum(r-0)^(n) sum(P-0)^(...

The valur of `sum_(r-0)^(n) sum_(P-0)^(r) ""^(n)C_(r) . ""^(r)C_(p)` is equal to

A

`2^(n)`

B

`2^(2n)`

C

`2^(n+1)`

D

`2^(3n)`

Verified by Experts

The correct Answer is:

B

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