Question 13
Find the last digit of $A=1+7+7^2+7^3+\cdots+7^{887}+7^{888}$.
TIMO - 2018 - Grade 8 - Preliminary Round - Paper 4 Question 13
TIMO · TIMO - 2018 - Grade 8 - Preliminary Round - Paper 4
TIMO · TIMO - 2018 - Grade 8 - Preliminary Round - Paper 4