If the sum of the series sum(n=0)^(oo) r...

If the sum of the series `sum_(n=0)^(oo) r^(n), |r| lt 1` is s then sum of the series `sum_(n=0)^(oo) r^(2n)` is

A

`s^(2)`

B

`(2s)/(s^(2)-1)`

C

`(s^(2))/(2s+1)`

D

`(s^(2))/(2s-1)`

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The correct Answer is:

D

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