If x & y are both positive integers, and x>y, what's the units digit of (10^x-9^y)^2=?
A) 1
B) 3
C) 5
D) 8
E) 9
I thought it should be 9, but that's not the answer.
A) 1
B) 3
C) 5
D) 8
E) 9
I thought it should be 9, but that's not the answer.
