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Math Help - proof of coprime numbers

  1. #1
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    proof of coprime numbers

    i have the question 'prove that if a and b are coprime, then ab and a+b are also coprime.' i have no idea where to start.. ?
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  2. #2
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    Re: proof of coprime numbers

    Hint: Use proof by contrapositive and express aČ and bČ as linear combinations of ab and a + b.
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