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The sum of the series 1+2x+3x^2 +4x^2 +…...

The sum of the series `1+2x+3x^2 +4x^2 +…`.upto n terms is

A

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

B

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

C

`x^(n+1)`

D

None of these

Text Solution

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The correct Answer is:
A
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