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" If "S(n)" denotes the sum of "n" terms...

" If "S_(n)" denotes the sum of "n" terms of an A.P.,prove that "S_(30)=3(S_(20)-8_(1)

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If S_(n) denotes the sum of the first n terms of an A.P.prove that S_(30)=3(S_(20)-S_(10)).

If S_n denotes the sum of the first n terms of an A.P., prove that S_(30)=3(S_(20)-S_(10)) .

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If S_n denotes the sum of first n terms of an A.P., prove that S_(12)=3(S_8-S_4) .

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If S_n denotes the sum of first n terms of an A.P. prove that S_12=3(S_8-S_4) .

If S_(n), denotes the sum of n terms of an A.P. then S_(n+3)-3S_(n+2)+3S_(n+1)-S_(n)=