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

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If the sum of the first n terms of an A.P. is (1/2)[3n2 + 7n], then find its nth term. Hence write its 20th term.

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Hence, a2 = 62

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