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.
104 or 10000
There is only one combination. The order does not matter in a combination.
There is only 1 combination.
there are 4
120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.
There can be 103 = 1000 codes.
I would have to say 10,000 possible combinations. (0000, 0001, 0002 through 9998, 9999)
I would not like a list all possible 4 digit combination using 0-9.
The possible 4 digit codes using the numbers 0-9 are every number between 0 and 9999. For numbers that have less than 4 digits, just precede the number with 0's. 10,000 possibilities
The number of 4 digit codes, using different digits, is 10*9*8*7 = 5040. However, computer passwords can, usually, have repeated digits and, if that is allowed, you can have 104 = 10000 codes.
4, thats all i know
5-digit ZIP Codes were introduced in 1963. The ZIP+4 system was introduced in the early 1980's.
In other words, how many 4 digit combination locks are there using the digits 0-9 on each wheel. There are 10×10×10×10 = 10⁴ = 10,000 such combinations.
4*4*4 = 64 of them.