How many combinations with 4 numbers 1 4 with repeating
Asked by admin @ in Mathematics viewed by 314 People
How many possible combinations are there on a 4 digit lock using numbers 0-9, if duplicate numbers are not allowed?
Answered by admin @
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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