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sum(r=0)^m "^(n+r) Cn is equal to...

`sum_(r=0)^m "^(n+r) C_n` is equal to

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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