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A student says that if \(\sqrt{3}=\frac{p}{q}\), where \(p\) and \(q\) are coprime integers, then even if \(p\) is divisible by 3, \(q\) need not be divisible by 3. Why is the statement incorrect?

Answer and explanation

Correct answer: Because \(p^2=3q^2\) shows that both \(p\), and then \(q\), are divisible by 3.

From \(p^2=3q^2\), \(p^2\) is divisible by 3, so \(p\) is divisible by 3. Put \(p=3k\); then \(q^2=3k^2\), so \(q\) is also divisible by 3. This contradicts coprimality. Exam tip: look for a common factor in both terms.

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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