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A student assumes that \(\sqrt{2}=\frac{a}{b}\), where \(a\) and \(b\) are coprime integers. From \(a^2=2b^2\), the student stops after concluding that \(a\) is even. Which conclusion is necessary to complete the proof?

Answer and explanation

Correct answer: Both \(a\) and \(b\) are even; this contradicts their being coprime.

From \(a^2=2b^2\), \(a\) is even; write \(a=2k\). Substitution gives \(b^2=2k^2\), so \(b\) is also even. Thus both share factor 2, contradicting coprimality. Exam tip: state the lowest-terms contradiction clearly.

Related tags

Number SystemsIrrational NumbersProof By ContradictionSquare Root 2Coprime IntegersProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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