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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