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In the proof that \(\sqrt{3}\) is irrational, assume \(\sqrt{3}=\frac{p}{q}\) in lowest terms. If \(p\) is shown to be divisible by 3, which conclusion about \(q\) is needed to obtain a contradiction?

Answer and explanation

Correct answer: \(q\) is divisible by 3

Put \(p=3k\). Then \(3q^2=p^2=9k^2\), so \(q^2=3k^2\) and \(q\) is also divisible by 3. Thus \(p\) and \(q\) have a common factor, contradicting lowest terms. Exam tip: state the common-factor contradiction clearly.

Related tags

Number SystemsIrrational NumbersProof By ContradictionSquare Root 3Rational NumbersProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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