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.. ?

Printable View

- October 24th 2012, 05:20 AMalgebra123proof 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.. ?

- October 24th 2012, 05:28 AMemakarovRe: proof of coprime numbers
Hint: Use proof by contrapositive and express aČ and bČ as linear combinations of ab and a + b.