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[" Q(1) If sn denotes the sum of I nterms of an "],[" Aip,Prove that "0_(30)=3[5_(20)-S_(10)" ] "]

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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)).

If S_n denotes the sum of first n terms of an AP, prove that S_(12) = 3 (S_(8) -S_4)

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 first n terms of an A.P. prove that S_12=3(S_8-S_4) .

If S_(n) denotes the sum of first n terms of an AP, then prove that S_(12)=3(S_(8)-S_(4)).

If S_(n) denotes the sum of first n terms of an AP, then 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=

Let S, denote the sum of first k terms of on AP. What is S_(30)/(S_(20)-S_(10)) equal to?