How many 3-digit numbers have no zeros? How many 3-digit numbers have no zeros and no fives? How many 3-digit numbers have no zeros but at least one five?
I'm just really confused on how to do this. I figured the first was 729 and the second was 512 but I'm very stuck on the third one.
Best Answer
HINT
For the third case let start from case 1 and subtract the number of cases without 0 and 5.