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Math Help - Number of 4 digit codes in logarithmic form.

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    Number of 4 digit codes in logarithmic form.

    A security PIN code is four digits long. Each digit could have the value 0 to 9. If an office building needs 10 security PINs, express the number of codes in logarithmic form with base 10.
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    Re: Help needed!

    Quote Originally Posted by BlazingJatt View Post
    A security PIN code is four digits long. Each digit could have the value 0 to 9. If an office building needs 10 security PINs, express the number of codes in logarithmic form with base 10.
    If digits can be repeated as in 9009 then there 10^4 different codes.

    If digits can not be repeated as in 1079 then there 10\cdot 9\cdot 8\cdot 7 different codes.

    In either case choose ten of that number.
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