SOLUTION: In an AP. prove that d= s[n] - 2S[n-1] +S[n-2]

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Question 778416: In an AP. prove that d= s[n] - 2S[n-1] +S[n-2]
Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
If you need the proof and are read to pay for this then contact me.