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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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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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A and B are the first term and common difference of the A.P.

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