Question 12
Find the units digit of $1+3^1+3^2+3^3+\cdots+3^{2020}+3^{2021}$.
TIMO 2021 - Senior Secondary (Grades 10-12) - Preliminary Round - Paper 1 Question 12
TIMO · TIMO 2021 - Senior Secondary (Grades 10-12) - Preliminary Round - Paper 1
TIMO · TIMO 2021 - Senior Secondary (Grades 10-12) - Preliminary Round - Paper 1