1.

If `S_p`denotes the sum of the series `1+r^p+r^(2p)+ toooa n ds_p`the sum of the series `1-r^(2p)r^(3p)+ tooo,|r|

Answer» Correct Answer - A
`S_(p)=1/(1-r^(P)),s_(P)=1/(1+r^(p)),S_(2p)=1/(1-r^(2p))`
Clearly
`S_(p)+s_(p)=2/(1-r^(2p))=2S_(2p)`


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