50 Followers Problem

If the sum of the terms n, 2n , 3n , of an AP are S1{ S }_{ 1 }, S2{ S }_{ 2 } and S3{ S }_{ 3 } then S3(S2S1)\frac { { S }_{ 3 } }{ { (S }_{ 2 }-{ S }_{ 1 })\quad \quad } is

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