csat-suneung 2018 Q12

csat-suneung · South-Korea · csat__math-humanities 3 marks Binomial Theorem (positive integer n) Find a Specific Coefficient in a Single Binomial Expansion
In the expansion of $\left( x + \frac { 2 } { x } \right) ^ { 8 }$, find the coefficient of $x ^ { 4 }$. [3 points]
(1) 128
(2) 124
(3) 120
(4) 116
(5) 112
In the expansion of $\left( x + \frac { 2 } { x } \right) ^ { 8 }$, find the coefficient of $x ^ { 4 }$. [3 points]\\
(1) 128\\
(2) 124\\
(3) 120\\
(4) 116\\
(5) 112