math

how many 5 dight numbers are there with distinct dights.
ans choices arw
144
27216
4386
6843
720
I need to see how to solve it step by step thanks

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  1. For the first digit, there are 9 choices (excluding 0, which does not make a 5 digit number).
    For the second digit, there are still 9 choices, since zero is in , and the first digit is out).
    Third digit: 10-2 choices
    fourth digit: 10-3 choices
    fifth digit: 10-4 choices.

    By the multiplication rule, there are:
    9*9*8*7*6 5-digit numbers with distinct digits.

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