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Asked by vincent

If digits cannot be repeated, how many four-digit numbers can be made using the digits 1, 3, 5,7, and 9 ?
12 years ago

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Answered by Steve
5*4*3*2 = 120

Each time you choose a digit, the number remaining goes down by one.
12 years ago
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If digits cannot be repeated, how many four-digit numbers can be made using the digits 1, 3, 5,7, and 9 ?

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