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sum(k=m)^n kCr...

`sum_(k=m)^n kC_r`

A

`"^(n+1)C_(r-1)`

B

`"^(n+1)C_(r+1) -^mC_r`

C

`"^(n+1)C_(r+1) -^mC_(r+1)`

D

`"^(n+1)C_(r+1) +^mC_(r+1)`

Text Solution

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The correct Answer is:
C
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