+118667 What is the units digit of the sum of 2^2020 + 7^2020
2,4,8,16,32,64 the pattern for the last digit is 2,4,8,6, 2,4,8,6, etc
2020=4*505 will end in 6
7,49, 343, 2401, 16807, 117649, the pattern for the last digit is 7,9,3,1, 7,9,3,1,
so
7^2020 will end in a 1
so 2^2020 + 7^2020 will end in 6*1= 6
