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Rima says, “\(\sqrt{2}\) is irrational because its decimal expansion is infinite.” What is the main flaw in her reasoning?

Answer and explanation

Correct answer: Repeating infinite decimals can be rational.

An infinite decimal alone does not prove irrationality: \(0.\overline{3}=1/3\) is infinite but rational. For \(\sqrt{2}\), establish non-repetition or use contradiction. Exam tip: every recurring decimal is rational.

Related tags

Number SystemsIrrational NumbersSquare Root 2Decimal ExpansionProof By ContradictionProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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