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

Asked by  | 2nd Mar, 2013, 11:53: AM

Expert Answer:

Sum of n term of the A.P, 

Thus, the value of  is d.

Answered by  | 3rd Mar, 2013, 05:56: AM

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