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

If the sum of the series `sum_(n=0)^oor^n ,|r|<1` is `s ,` then find the sum of the series `sum_(n=0)^oor^(2n)` .

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CENGAGE PUBLICATION-SEQUENCES AND SERIES-All Questions
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  2. If x=sum(n=0)^ooa^n , y=sum(n=0)^oob^n , z=sum(n=0)^ooc^n , w h e r e ...

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