if Sn denotes the sum if n terms of an A.P whose common difference is is d ,show that
d=Sn-2Sn-1+Sn-2
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if Sn denotes the sum if n terms of an A.P whose common difference is is d ,show that
d=Sn-2Sn-1+Sn-2
Dear Student!
Here is the link for the answer to your query.
Cheers!