If Sn denotes the sum of n terms of an A.P. whose common difference is d and the first term is a, find Sn- 2Sn-1+ Sn-2.

Asked by Palak Shrivastava | 29th Oct, 2013, 06:35: AM

Expert Answer:

Let a1 and d respectively be the first term and common difference of the AP.

Answered by  | 29th Oct, 2013, 09:13: AM

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