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sum(r=0)^(m)( n+r )C(n)=...

`sum_(r=0)^(m)( n+r )C_(n)=`

A

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

B

` n+m+2 C_(w)`

C

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

D

none of these

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The correct Answer is:
A
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