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

If `S_n` denote the sum of first `n` terms of an A.P. whose first term is `aa n dS_(n x)//S_x` is independent of `x ,t h e nS_p=` `p^3` b. `p^2a` c. `p a^2` d. `a^3`

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