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[" El the sum of "n,2n,3n" terms of an A...

[" El the sum of "n,2n,3n" terms of an A.P.be "S_(1),S," and "S_(y)" ,respectively,show that "],[=3(5,-S,)]

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Let the sum of n, 2n, 3n terms of an A.P. be S_1, S_2 and S_3 , respectively, show that S_3 =3(S_2-S_1)

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