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Math Help - Counting passwords

  1. #1
    Member oldguynewstudent's Avatar
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    Counting passwords

    How many eight-character passwords are there if each character is either an uppercase letter A-Z, a lowercase letter a-z, or a digit 0-9, and where at least one character and at least one number are used?

    Total number of passwords possible = 62^8

    then 10^8 of these are all numbers and 52^8 are all letters.

    So the answer would be 62^8 - 10^8 - 52^8.

    Correct?
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  2. #2
    MHF Contributor

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    Congratulations my friend, you have really come a long way.
    Yes indeed that is correct.
    Keep up that good work.
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