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?
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:
Let's think step by step.

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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?
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