50 Followers Problem

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

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