Q. 414.3( 6 Votes )
If d be the common difference of an A.P. and Sn be the sum of its n terms, then prove that d = Sn - 2Sn-1 + Sn-2
Given: Sn be the sum of n terms and d be the common difference.
To Prove: d = Sn - 2Sn-1 + Sn-2
Sn - 2Sn-1 + Sn-2
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The sum of n terms of an A.P. is 3n2+ 5n. Find the A.P. Hence, find its 16th term.KC Sinha - Mathematics