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0 through 9 is 10 digits.

For the first number you have 10 choices, same for the second and third and forth, so your total amount of possible combinations (assuming you can repeat) is:

10 * 10 * 10 * 10 = 104 = 10,000 (ten thousand)

If repetition is not allowed, then for the first you have 10 choices, second you have 9 (every digit except the one you used for the first), third you have 8 and forth you have 7, giving you:

10 * 9 * 8 * 7 = 5040

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Related Questions

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