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Suppose \\(\sqrt{3}=\frac{p}{q}\\), where \\(p\\) and \\(q\\) are coprime positive integers. Which conclusion from \\(p^2=3q^2\\) gives the contradiction needed to prove that \\(\sqrt{3}\\) is irrational?

Answer and explanation

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

From \\(p^2=3q^2\\), \\(3\\mid p^2\\); since 3 is prime, \\(3\\mid p\\). Put \\(p=3k\\) to get \\(q^2=3k^2\\), so \\(3\\mid q\\) too. This contradicts coprimality. Exam tip: if a prime divides a square, it divides the number itself.

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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