Question 7
Given $A=2^{2021}$, find $1+2+2^2+2^3+\cdots+2^{2020}$ in terms of $A$.
HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01 Question 7
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01