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Math Help - Hard question

  1. #1
    SND
    SND is offline
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    Hard question

    the question is:

    let a
    1, a2, a3, a4, a5 , be any distinct positive integers. Show that there exists at least one subset of three of these integers whose sum is divisible by 3.

    How do i do this?
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  2. #2
    Super Member angel.white's Avatar
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    Quote Originally Posted by SND View Post
    the question is:

    let a
    1, a2, a3, a4, a5 , be any distinct positive integers. Show that there exists at least one subset of three of these integers whose sum is divisible by 3.

    How do i do this?
    Apparently another kid in your class has already been here: http://www.mathhelpforum.com/math-he...rics-help.html
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