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While proving the irrationality of \(\sqrt{3}\) by contradiction, suppose \(\sqrt{3}=p/q\), where \(p\) and \(q\) are coprime. Which conclusion produces a contradiction to this assumption?

Answer and explanation

Correct answer: Both \(p\) and \(q\) are divisible by 3

From \(3q^2=p^2\), \(p^2\), hence \(p\), is divisible by 3. Putting \(p=3k\) shows that \(q\) is also divisible by 3, contradicting coprimality. Exam tip: a common factor in both numerator and denominator gives the contradiction.

Related tags

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

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