Hello, Snowing Amanda!
Since the order of the digits is important, these are permutations.How many 3-digit positive integers are odd and do not contain the digit "5"?
We have a three-digit number: .
The first digit, , can be . . . 8 choices.
The middle digit, , can be . . . 9 choices.
The last digit, , can be . . . 4 choices.
Therefore, there are: . such numbers.