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Evaluate sum(r=0)^(n) ""^(n+r)C(n) ....

Evaluate ` sum_(r=0)^(n) ""^(n+r)C_(n)` .

A

`""^(n +m+1 )C_(n+1)`

B

`""^(n+m+2)C_(n)`

C

`""^(n+m+3)C_(n-1)`

D

None of these

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The correct Answer is:
A
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