How many different 5-digit odd numbers can be formed from the digits 1, 2, 3, 4, 5, 6, 7, 8, 9 if repetitions are not allowed?
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Since the number cannot be even, the first digit must be one of the odd digits 1, 3, 5, 7, or 9. Therefore, there are 5 choices for the first digit. Show more…
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