Let Sn denote the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = Sn − kSn−1 + Sn−2, then k =(a) 1(b) 2(c) 3(d) none of these.

Let Sn denote the sum of n terms of an A.P. whose first term is a. If

1.	Let Sn denote the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = Sn − kSn−1 + Sn−2, then k =(a) 1(b) 2(c) 3(d) none of these.
Answer» Let S_n denote the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = S_n− kS_n₋₁ + S_n−2, then k = (a) 1 (b) 2 (c) 3 (d) none of these.

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Let Sn denote the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = Sn − kSn−1 + Sn−2, then k =(a) 1(b) 2(c) 3(d) none of these.

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