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If Sn=1+r^n+r^(2n)+r^(3n)+.... to oo and...

If `S_n=1+r^n+r^(2n)+r^(3n)+....` to `oo` and `s_n=1-r^n+r^(2n)-r^(3n)+...` to `oo` then prove that `S_n+s_n=2S_(2n)`.

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