Prove that a sequence in an A.P., if the sum of its $n$ terms is of the form $A n^{2} + B n, w h e r e A, B$ are constants.

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Prove that a sequence in an A.P., if the sum of its

n

terms is of the form

A n^{2} + B n, w h e r e A, B

are constants.

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Question Text

Prove that a sequence in an A.P., if the sum of its

n

terms is of the form

A n^{2} + B n, w h e r e A, B

are constants.

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