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