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The first digit can be any one of 10 digits. For each of those . . .

The second digit can be any one of the remaining 9 digits. For each of those . . .

The third digit can be any one of the remaining 8 digits. For each of those . . .

The fourth digit can be any one of the remaining 7 digits.

The total number of possibilities is (10 x 9 x 8 x 7) = 5,040

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Q: How many 4 digit pin numbers are available if no number is repeated?
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