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How many 4 digit passcodes are possible if no digits are repeated

How many 4 digit passcodes are possible if no digits are repeated
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3 votes
How many 4 digit passcodes are possible if no digits are repeated

User Pavel Nuzhdin
by
8.4k points

1 Answer

3 votes
10 numbers
4 parts

1st slot: 10 choices
2nd slot: 9 choies (1 less than 10)
3rd slot: 8 choies (1 less than 9)
4th slot: 7 choices (1 less than 8)


10*9*8*7=5040

answer is 5040 codes
User Viclim
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