Question 7
Find the coefficient of $x$ in $(x+1/x)^4(x-1/x)^5$.
HKIMO 2017 THPT (Grades 10–12 shared) National Final (Heat) Set 04 Question 7
HKIMO · HKIMO 2017 THPT (Grades 10–12 shared) National Final (Heat) Set 04
HKIMO · HKIMO 2017 THPT (Grades 10–12 shared) National Final (Heat) Set 04