If you raise 9 to the 387th power, what is the units digit of the result

If you rise 9 to the 387th power the correct answer is 9

9*9 = 81, 81*9 = 729, 729*9 = 8561, 8561 * 9 = 59049 and so on

9^2 9^3 9^4 9^5

So the result of each multiplication is either 1 or 9 in the units digits

Even exponents give a 1 and odd give a 9 so 9^387 will have a units digit of

9.