There are 9C3 = 10*9*8/(3*2*1) = 120 of them.
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There are 9C3 = 84 combinations.
i would like a list all possible 4 digit combination using 0-9
There are 210 4 digit combinations and 5040 different 4 digit codes.
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.
To calculate the number of different 4-digit combinations that can be made using numbers 0 through 9, we use the concept of permutations. Since repetition is allowed, we use the formula for permutations with repetition, which is n^r, where n is the number of options for each digit (10 in this case) and r is the number of digits (4 in this case). Therefore, the number of different 4-digit combinations that can be made using numbers 0 through 9 is 10^4, which equals 10,000 combinations.