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(12) Cinven wan of the firm of an \( A P \) is \( 2 n + 3 n ^ { 2 } \). Another \( A \). P is iorned with the seame frem and denbire of the common dififierence. the sum of \( n \) terme of the new \( A \). R. I Whill onlume- 2013 . \( \begin{array} { l l l l } { \text { (1) } n + 4 n ^ { 3 } } & { \text { (2) } n ^ { 2 } + 4 n } & { \text { (3) } 3 n + 2 n ^ { 2 } } & { \text { (4) } 6 n ^ { 2 } - n } \end{array} \)

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