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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- December 12th 2012, 07:56 AMwille13Not 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 - December 12th 2012, 08:09 AMemakarovRe: Not completely sure how to prove this