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Let \(p\) and \(q\) be coprime positive integers. In a proof by contradiction for the irrationality of \(\sqrt{3}\), if \(3\mid p^2\), which conclusion is necessary?

Answer and explanation

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

Since 3 is prime, Euclid’s lemma gives \(3\mid p\) from \(3\mid p^2\). A conclusion about \(q\) follows only later after substituting \(p=3k\). In exams, state this prime-divisibility step clearly.

Related tags

Number SystemsIrrational NumbersProof By ContradictionSquare Root 3DivisibilityEuclids LemmaProof Of Irrationality Of Square Root 2 And Square Root 3Mathematics

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