Q. 165.0( 1 Vote )

The sum of n terms of an AP is. Find the common difference.

Answer :

Given: the sum of n terms of an AP is.


To find: common difference.


put n = 1 we get


First term =


Put n = 2 we get


First term + second term = 2 × a + 2 × b


Second term =


Therefore common difference will be


Second term – first term


Common difference = 2a


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