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If the sum of n terms of an A.P. is nP+1...

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

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V PUBLICATION-SEQUENCES AND SERIES-QUESTIONBANK
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  19. If the sum of n terms of an A.P is 3n^2+5n and its m^(th) term is 164....

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  20. Insert five numbers between 8 and 26 such that the resulting sequence...

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