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sn denotes the sum of first n terms of an AP, whose common difference is d, then   Sn-2Sn-1 + Sn-2 (n > 2) is equal to   A) 2d B) -d C) d D) None of these  Explain solution please  
Asked by Anubhavjain599 | 25 Aug, 2020, 22:16: PM
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Answered by Renu Varma | 26 Aug, 2020, 10:13: AM

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