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Let Sn denote the sum of first n terms o...

Let `S_n` denote the sum of first n terms of a G.P. whose first term and common ratio are a and r respectively. On the basis of above information answer the following question: The sum of product of first n terms of the G.P. taken two at a time in (A) `(r+1)/r S_nS_(n-1)` (B) `r/(r+1)S_n^2` (C) `r/(r+1)S_nS_(n-1)` (D) none of these

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