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Math Help - sum of the 4536 numbers from 1000 t0 10000 their digits distinct

  1. #1
    dch
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    sum of the 4536 numbers from 1000 t0 10000 their digits distinct

    Difficult problem:

    Find the sum of 4536 numbers from 1000 to 10000 which all have their digits distinct,

    Thanks
    -D
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  2. #2
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    Quote Originally Posted by dch View Post
    Difficult problem:

    Find the sum of 4536 numbers from 1000 to 10000 which all have their digits distinct,

    Thanks
    -D
    Odd, I just answered this question. See this thread, post #5. But try to work out some stuff for yourself, since I have a complete solution up there.
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  3. #3
    dch
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    difficult problem

    I don't think I entirely understand the solution

    Is there another way??

    Thanks
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  4. #4
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    Quote Originally Posted by dch View Post
    I don't think I entirely understand the solution

    Is there another way??

    Thanks
    Are you allowed to write a computer program? For a brute force algorithm, think about how you would test whether a given number has all its digits distinct. Hint: Use a boolean array.
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