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Rima assumes that \(\sqrt{3}=\frac{a}{b}\), where \(a\) and \(b\) are coprime positive integers. Which conclusion in her proof establishes a contradiction?

Answer and explanation

Correct answer: Both \(a\) and \(b\) are divisible by 3

From \(a^2=3b^2\), prime divisibility gives \(3\mid a\). Put \(a=3k\): then \(b^2=3k^2\), so \(3\mid b\) too. This contradicts coprimality. Exam tip: explicitly state the prime-divisor rule.

Related tags

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

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