ConceptSum of First n Terms of an AP

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#### Question

If the sum of the first *n* terms of an A.P. is `1/2`(3n^{2} +7n), then find its *n*^{th} term. Hence write its 20^{th} term.

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#### Reference Material

Solution for concept: Sum of First n Terms of an AP. For the course 8th-10th CBSE