The sum of first \( n \) terms of an AP is \( \left(3 n^{2}+6 n\rig...

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The sum of first \( n \) terms of an AP is \( \left(3 n^{2}+6 n\right) \). The common difference
PW of the AP is
(a) 6
(b) 9
(c) 15
(d) \( -3 \)
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