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There are 256. Some of them are:

1111, 1112, 1113, 1114, 1121, ...

2111, 2112, 2113, ...

3111, 3112, ...

4111, etc.

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Wiki User

15y ago

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256

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Anonymous

4y ago
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Q: What are all the possible 4 digit codes using the numbers 1-4?
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