Question: $$ text { 3. What is the coefficient of } x_{1}^{3} x_{2}^{2} x_{3} text { in the expansion of }left(x_{1}+2 x_{2}+x_{3} ight)^{6} text { ?

 $$ \text { 3. What is the coefficient of } x_{1}^{3}

$$ \text { 3. What is the coefficient of } x_{1}^{3} x_{2}^{2} x_{3} \text { in the expansion of }\left(x_{1}+2 x_{2}+x_{3} ight)^{6} \text { ? } $$ SP. AS413

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