-- If you're allowed to repeat digits in one combination,
then there are 104 = 10,000 possibilities.
-- If all four of the digits must be different, then there are
(10 x 9 x 8 x 7) = 5,040 possibilities.
Chat with our AI personalities
There are 9C3 = 84 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.
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.
There are 210 4 digit combinations and 5040 different 4 digit codes.
There are 10,000 possible combinations, if each number can be used more than once.