If the \( n \)th term of an AP is \( (2 n+1) \) then the sum of its...

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If the \( n \)th term of an AP is \( (2 n+1) \) then the sum of its first three terms is
\( \mathrm{P} \)
(a) \( 6 n+3 \)
(b) 15
(c) 12
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