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If the r^(th) term of a series is 1 + x ...

If the `r^(th)` term of a series is `1 + x + x^2 + .......+ x^(r-1)` , then the sum of the first n terms is

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
A
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