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Math Help - Not completely sure how to prove this

  1. #1
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    Not completely sure how to prove this

    Please help with this:

    By considering the possible residue classes modulo 5 of a square, or otherwise, prove that if p^2 + q^2 + r^2 is divisible by 5 then 5 divides at least one of p,q,r
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  2. #2
    MHF Contributor
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    Re: Not completely sure how to prove this

    Consider these two threads.
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