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24 November, 16:17

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

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  1. 24 November, 16:18
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    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
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