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How many 3 digit numbers can be formed from the digits 1 through 9 if the digits can be used only once?
Wiki User
∙ 13y ago
The first digit can be any one of the 9. For each of these . . .
The second digit can be any one of the 8 not already used. For each of these . . .
The third digit can be any one of the 7 not already used.
Total number of possibilities = (9 x 8 x 7) = 504
Wiki User
∙ 13y ago
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10,000
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27 three digit numbers from the digits 3, 5, 7 including repetitions.
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500
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840
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180 of them.
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