AA n in , 1+2x + 3x^(2) + ….+ n.x^(n-1) ...

`AA n in , 1+2x + 3x^(2) + ….+ n.x^(n-1) = (x in R, x ne 1)`

A

`( 1 - ( n+1) x^(n) + n.x^(n+1) )/( ( 1-x)^2)`

B

`((n+1)x^n)/( (1-x)^2) `

C

`(1- (n+1) x^n + n.x^(n+1))/( (1+x)^2)`

D

`((n-1)x^n)/( (1+x)^2)`

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The correct Answer is:

A, B

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