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 If SP denotes the sum of the series 1+rp+r2p+. to ond Sp denotes  the sum of the series 1rp+r2pr3p+.to,|r|<1, then Sp+sp in terms of S2p is 

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a
2S2p
b
0
c
12S2p
d
-12S2p

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detailed solution

Correct option is A

SP=11−rp,sp=11+rp,S2p=11−r2p Clearly, SP+sp=21−r2p=2S2p


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