1. If Sn denotes the sum of n terms of an AP whose common difference is d and 1st term is a. Find Sn – 2Sn – 1 + Sn – 2 .

Asked by afreensyed13 | 2nd Apr, 2017, 04:12: PM

Expert Answer:

Answered by Rebecca Fernandes | 2nd Apr, 2017, 09:28: PM