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If Sn denote the sum of n terms of an...

If `S_n` denote the sum of `n` terms of an A.P. with first term `a` and common difference `d` such that `(S_x)/(S_(k x))` is independent of `x` , then `d=a` (b) `d=2a` (c) `a=2d` (d) `d=-a`

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