If Sn denotes the sum of n terms of an AP whose common difference is d and first term is a

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If S_n denotes the sum of n terms of an AP whose common difference is d and first term is a, find S_n-2 S_(n-1)+ S_(n-2)
  1. KHAJA ACADEMY MATHEMATICA
  2. #If Sn denotes the sum of n terms of an AP whose common difference is d and first term is a
  3. #cbse class 10
  4. #class 10 progressions
  5. #class 10 Arithmetic Progression sum problem
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Good explanation thank you sir. please upload more problems

KAPREKAR-yvop