Question

Which of the following could be the units digit of 57 to the power n where n is a positive integer?

Answer 1

is the same as for the unit digit we care about.

Of course, 7 raised to a power has a repeating pattern


unit digit is 9
unit digit is 3
.........
up to

The only answer are B,D,H and J
_________________

Answer 2

1,3,7,9 are only possible digit