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

Answer» Correct Answer - A


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