Question 21
How many unlike terms occur after expanding $(a+b+c)^{15}(a+d+e)^7$?
HKIMO 2026 THPT (Grades 10–12 shared) National Final (Heat) Set 05 Question 21
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Final (Heat) Set 05
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Final (Heat) Set 05