CBSE Class 10 Answered
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 | 29 Oct, 2013, 06:35: AM
Expert Answer
Let a1 and d respectively be the first term and common difference of the AP.
Answered by | 29 Oct, 2013, 09:13: AM
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