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If S(n) denotes the sum of first n terms...

If `S_(n)` denotes the sum of first n terms of an A.P whose first term is a and `(S_(nx))/(S_(x))` is independent of x then `S_(p)=`

A

`p^(3)`

B

`p^(2) a`

C

`pa^(2)`

D

`a^(3)`

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