Question:
How many odd five-digit counting numbers can be formed by  choosing digits from the set $\{1, 2, 3, 4, 5, 6, 7\}$ if digits can be repeated?

Answer:
We know a number is odd if and only if its unit digit is odd. so we have 4 choices for its units digit. Then we have 7 choices for each of the other digits, yielding $7\times7\times7\times7\times4=\boxed{9604}$ numbers.