If the sum ofn, 2n, 3n terms of an arithmetic progression are s,, S, S, respectively
then prove that s3 = 3 (s,-s,).

Question

If the sum ofn, 2n, 3n terms of an arithmetic progression are s,, S, S, respectively then prove that s3 = 3 (s,-s,).​​

Hailey · Answer

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If the sum ofn, 2n, 3n terms of an arithmetic progression are s,, S, S, respectivelythen prove that s3 = 3 (s,-s,).​​