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If in an A.P., Sn=n^2p and Sm=m^2p , ...

If in an A.P., `S_n=n^2p` and `S_m=m^2p` , where `S_r` denotes the sum of `r` terms of the A.P., then `S_p` is equal to `1/2p^3` (b) `m n\ p` (c) `p^3` (d) `(m+n)p^2`

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