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

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

### Asked by godson babuji | 5th Nov, 2014, 02:18: AM

Expert Answer:

### Answered by Prasenjit Paul | 2nd Apr, 2017, 09:27: PM

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