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If C(n) is the coefficient of x^(n) in t...

If `C_(n)` is the coefficient of `x^(n)` in the expansion of `(1 + x)^(n),"then C"_(1) + 2.C_(2) + 3.C_(3) +....+ n.C_(n) =`

A

`2^(n)`

B

`n.2^(n)`

C

`n.2^(n+1)`

D

`n.2^(n-1)`

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