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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1 Answer

For each digit position there are 7 possible digits, so the total number is 7*7*7*7*4=9,604, because the last digit has to be odd, and that means it can only be 1, 3, 5 or 7.
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