Too many to list here-see below.
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i would like a list all possible 4 digit combination using 0-9
If the digits can repeat, then there are 256 possible combinations. If they can't repeat, then there are 24 possibilities.
This question needs clarificatioh. There are 4 one digit number combinations, 16 two digit combinations, ... 4 raised to the n power for n digit combinations.
There are 840 4-digit combinations without repeating any digit in the combinations.
There are 210 4 digit combinations and 5040 different 4 digit codes.