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

asked Mar 14, 2018 in Mathematics by paayal (26,720 points)

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

1 Answer

answered Mar 14, 2018 by sanjaydas (61,430 points)
selected Mar 15, 2018 by faiz

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

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