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In the proof that \(\sqrt{3}\) is irrational, we assume \(\sqrt{3}=\frac{p}{q}\) in lowest terms, where \(p\) and \(q\) are integers and \(q\neq0\). Which situation is impossible?

Answer and explanation

Correct answer: \(\gcd(p,q)\neq 1\) (\(p\) and \(q\) are not coprime)

If \(\sqrt{3}=\frac{p}{q}\) is taken in lowest terms, then by definition \(\gcd(p,q)=1\). Any situation with \(\gcd(p,q)\neq1\) contradicts the “lowest terms” condition, so it is impossible. The condition \(q\neq0\) is also required, but the clearly stated impossibility within the setup of coprime lowest terms is \(\gcd(p,q)\neq1\).

Related tags

Irrationality\Sqrt{3}CoprimeLowest TermsProof

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