If the sum of first end term of ap is 1/2 (3n^2+7n) then find it's nth term and then find 20th term.
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∴ Second term = S2 − S1 = 13 − 5 = 8. Thus, nth term of this A.P. is 3n + 2. Thus, 20th term of this A.P is 62.
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