The first term, last term and common difference of an A.P are respectively a, l and 1. Prove that
Channel: Doubtnut
Date: 2019-12-27

The first term, last term and common difference of an A.P are respectively a, l and 1. Prove that the sum of this A.P. is `(1)/(2)(a+b)(1-a+b).`

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