If \( \left(1+2 x+3 x^{2}\right)^{10}=a_{0}+a_{1} x+a_{2} x^{2}+\ldots+a_{20} x^{20} \), then \(....

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If \( \left(1+2 x+3 x^{2}\right)^{10}=a_{0}+a_{1} x+a_{2} x^{2}+\ldots+a_{20} x^{20} \), then
\( \mathrm{P} \)
\( a_{1} \) equals
W
(1) 10
(2) 20
(3) 210
(4) 420



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