What is the coefficient of $x ^ { 9 }$ in the expansion of $\left( x ^ { 3 } + 3 \right) ^ { 5 }$? [2 points] (1) 30 (2) 60 (3) 90 (4) 120 (5) 150
What is the coefficient of $x ^ { 9 }$ in the expansion of $\left( x ^ { 3 } + 3 \right) ^ { 5 }$? [2 points]\\
(1) 30\\
(2) 60\\
(3) 90\\
(4) 120\\
(5) 150