If `S_n` denotes the sum of n terms of an A.P. whose common difference is d and first term is a,find
Channel: Doubtnut
Date: 2019-12-27

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

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