) Sum of first n terms of an A.P. is of the form `An^2 + Bn` i.e. aquadratic expression in n,
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Channel: Doubtnut · 2018 · Education
To ask Unlimited Maths doubts download Doubtnut from - https://goo.gl/9WZjCW ) Sum of first n terms of an A.P. is of the form `An^2 + Bn` i.e. aquadratic expression in n, in such case the common differenceis twice the coefficient of `n^2`. i.e. 2A
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