For all integers a and b, if a^2 is congruent to b^2 (mod 20), then a is congruent to b (mod 5). prove true or false

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- September 21st 2011, 07:16 PMlemondonutProof help
For all integers a and b, if a^2 is congruent to b^2 (mod 20), then a is congruent to b (mod 5). prove true or false

- September 22nd 2011, 12:50 AMchisigmaRe: Proof help