csat-suneung 2019 Q6

csat-suneung · South-Korea · csat__math-humanities 3 marks Binomial Theorem (positive integer n) Find a Specific Coefficient in a Single Binomial Expansion
What is the coefficient of $x ^ { 4 }$ in the expansion of the polynomial $( 1 + x ) ^ { 7 }$? [3 points]
(1) 42
(2) 35
(3) 28
(4) 21
(5) 14
What is the coefficient of $x ^ { 4 }$ in the expansion of the polynomial $( 1 + x ) ^ { 7 }$? [3 points]\\
(1) 42\\
(2) 35\\
(3) 28\\
(4) 21\\
(5) 14