Q. 205.0( 7 Votes )

The sums of first

Answer :

As we know that sum of An AP, upto first n terms is



Where S = sum of first n terms


a = first term , d = common difference


For first AP a = 1, d = 1




For second AP a = 1 , d = 2




For second AP a = 1 , d = 3




Adding S1 and S3




Hence proved.


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