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Suppose \(\sqrt{3}=\frac{p}{q}\), where \(p\) and \(q\) are coprime integers. Which property is used to infer \(3\mid p\) from \(3\mid p^2\) in the proof?

Answer and explanation

Correct answer: Prime divisor property: If a prime divides the square of an integer, it also divides that integer

Since 3 is prime and \(p^2=p\times p\), Euclid’s lemma gives \(3\mid p\) from \(3\mid p^2\). Applying the same idea to \(q\) contradicts coprimality. Exam tip: this inference specifically requires the divisor to be prime.

Related tags

Irrational NumbersProof By ContradictionPrime Divisor PropertySquare Root 3Number SystemsProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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