If the sum of n terms of an A.P. is nP+...

If the sum of n terms of an A.P. is `nP+1/2n(n-1)Q` , where P and Q are constants, find the common difference.

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The correct Answer is:

the common differnce is given by `d = a_(2) - a_1 = (P+Q) - P = Q`

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