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In the proof by contradiction that \(\sqrt{3}\) is irrational, suppose \(\sqrt{3}=\frac{p}{q}\), where \(p\) and \(q\) are coprime. From \(p^2=3q^2\), which conclusion is necessary?

Answer and explanation

Correct answer: 3 divides \(p\)

Since \(p^2=3q^2\), 3 divides \(p^2\). As 3 is prime, it must divide \(p\). Putting \(p=3k\) then shows that 3 divides \(q\) too, contradicting coprimality. Exam tip: use the prime-divisor property for a square.

Related tags

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

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