Find the sum of n, 2n, 3n terms of an ap is S1 s2 and s3 respectively, show that s3 = (S2-S1)

Find the sum of n, 2n, 3n terms of an ap is S1 s2 and s3 respectively,

1.	Find the sum of n, 2n, 3n terms of an ap is S1 s2 and s3 respectively, show that s3 = (S2-S1)
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