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If S(n) denotes the sum of first n natur...

If S(n) denotes the sum of first n natural numbers.the [S_(1)+S_(2)x+S_(3)x^(2)+........+S_(n)*x^(n-1)+..],[" ,then n is

A

`S_(2^(n)-k)`

B

`S_(2^(n)+k-1)`

C

`S_(2^(n)-k)`

D

`S_(2n-k)`

Text Solution

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The correct Answer is:
D
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