gaokao 2015 Q11

gaokao · China · fujian-science Binomial Theorem (positive integer n) Find a Specific Coefficient in a Single Binomial Expansion

11. The coefficient of $x ^ { 2 }$ in the expansion of $( x + 2 ) ^ { 5 }$ equals $\_\_\_\_$. (Answer with a number)

11. The coefficient of $x ^ { 2 }$ in the expansion of $( x + 2 ) ^ { 5 }$ equals $\_\_\_\_$. (Answer with a number)