1.

Find the sum to infinity of the series 1+3x+5x^2+7x^3+oow h e n|x|

Answer»

`2(1-x^n-1)`
`2X(1-x^n-1)//(1-x^2)`
`2x(1-x^n-1)//(1-x)^2+1-(2n-1)x^n//(1-x)`
NONE of these

Answer :C


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