The sum of first \( n \) terms of an AP is \( \left(5 n-n^{2}\right...

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The sum of first \( n \) terms of an AP is \( \left(5 n-n^{2}\right) \). The \( n \)th term of the AP is
(a) \( (5-2 n) \)
(b) \( (6-2 n) \)
(c) \( (2 n-5) \)
(d) \( (2 n-6) \)
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