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The sum of first `n` terms of an AP is `(3n^2+6n)` Find the `n^(th)` term and `15^(th)` terms of the AP

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The sum of first `n` terms of an AP is `(3n^2+6n)` Find the `n^(th)` term and `15^(th)` terms of the AP
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Correct Answer - `T_(n) = (6n + 3), T_(15) = 93`
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