If the sum of the first n terms of an AP is given by S_n=3n^2-n then find its nth terms, first term and common difference

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If the sum of the first n terms of an AP is given by S_n=3n^2-n then find its nth terms, first term and common difference

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Correct Answer - (i) T_(n) = (6n-4) (ii) a = 2 (iii) d = 6