If Sp denotes the sum of the series 1+r^...

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|<1,t h e nS_p+s_p` in term of `S_(2p)` is `2S_(2p)` b. `0` c. `1/2S_(2p)` d. `-1/2S_(2p)`

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