tmua 2017 Q13

tmua · Uk · paper1 1 marks Binomial Theorem (positive integer n) Determine Parameters from Conditions on Coefficients or Terms
In the expansion of $( a + b x ) ^ { 5 }$ the coefficient of $x ^ { 4 }$ is 8 times the coefficient of $x ^ { 2 }$.
Given that $a$ and $b$ are non-zero positive integers, what is the smallest possible value of $a + b$ ?
A 3
B 4
C 5
D 9
E 13
F 17
& C 
In the expansion of $( a + b x ) ^ { 5 }$ the coefficient of $x ^ { 4 }$ is 8 times the coefficient of $x ^ { 2 }$.

Given that $a$ and $b$ are non-zero positive integers, what is the smallest possible value of $a + b$ ?

A 3

B 4

C 5

D 9

E 13

F 17
Paper Questions
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20