2 years ago

How many possible combinations are there on a 4 digit lock using numbers 0-9, if duplicate numbers are not allowed?

1 answer:

4 0

0,1,2,3,4,5,6,7,8,9 = 10 possible numbers
No repeats so every time you use one subtract it from the amount of numbers you have.
10x9x8x7=5,040

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