1.

If S_n denotes the sum of first n natural number then S_1 + S_2x + S_3 x^2 +……+S_n x^(n-1) + ……oo terms =

Answer»

`(1 -X )^(-1)`
`(1-x)^(-2)`
`(1 -x)^(-3)`
`(1 - x)^(-4)`

Answer :C


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