gaokao 2018 Q5

gaokao · China · national-III-science 5 marks Binomial Theorem (positive integer n) Find a Specific Coefficient in a Single Binomial Expansion

The coefficient of $x ^ { 4 }$ in the expansion of $\left( x ^ { 2 } + \frac { 2 } { x } \right) ^ { 3 }$ is
A. 10
B. 20
C. 40
D. 80

The coefficient of $x ^ { 4 }$ in the expansion of $\left( x ^ { 2 } + \frac { 2 } { x } \right) ^ { 3 }$ is\\
A. 10\\
B. 20\\
C. 40\\
D. 80