How many positive 2-digit odd numbers can be formed using 0,1, 2, 3, 4, 5 without repetition?
The ones digit must be one of 1, 3, or 5 so there are 3 choices
After selecting the first digit, there are 5 choices left but the first digit cannot be a 0 so there are 4 choices.
4*3=12 numbers
:D
