Q. 125.0( 3 Votes )

Mark the correct alternative in the following:

If are in A.P. with common difference d, then the sum of the series , is

A.

B.

C.

D.

Answer :

Here,a1, a2,…,an are in A.P.


Then d=a2-a1=a3-a2=…=an-an-1







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