Let sum of n, 2n, 3n, terms of an A.P ar...

Let sum of `n`, `2n`, `3n`, terms of an A.P are `S_(1), S_(2), S_(3)` respectively. Prove that `S_(3) = 3 (S_(2) - S_(1))`.

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` :. S_(3) = 3(S_(2) - S_(1))`

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