How many odd five-digit counting numbers can be formed by choosing digits from the set {1, 2, 3, 4, 5, 6, 7, 8} if digits can be repeated?
8 choices for the first 4 digit.
4 choices for the last digit. (1, 3, 5, 7)
Any idea how you could approach it from here?
=^._.^=
