Combination codes are actually permutations and notcombinations. The number of codes depends on how long (how many digits) the code is and that is not specified in the question. Also, the number of codes depends on whether or not the digits may be repeated - again, not specified in the question.
There are 24 permutations that use each of the numbers once in a 4-digit code.
There are infinitely many codes in which the numbers can be used repeatedly, each an infinite number of times!
There are 210 4 digit combinations and 5040 different 4 digit codes.
There is only one combination. The order does not matter in a combination.
5,040
I would not like a list all possible 4 digit combination using 0-9.
5
There are 210 4 digit combinations and 5040 different 4 digit codes.
104 or 10000
There is only one combination. The order does not matter in a combination.
5,040
There is only 1 combination.
3024
there are 4
4
I would have to say 10,000 possible combinations. (0000, 0001, 0002 through 9998, 9999)
120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.
There can be 103 = 1000 codes.
5