IF s_n the sum of first n terms of an AP  is givenby S_n=5n²+3n then find its n^th term

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https://www.meritnation.com/ask-answer/question/if-sn-the-sum-of-first-n-terms-of-an-a-p-is-given-by-sn-5/quadratic-equations/3189303

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