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A student says that the decimal expansion of \(\sqrt{3}\) is 1.732... and does not terminate; therefore, \(\sqrt{3}\) is irrational. What is the main error in the student's reasoning?

Answer and explanation

Correct answer: A non-terminating decimal alone does not prove irrationality, because a rational number may have a recurring decimal expansion.

A non-terminating decimal is not sufficient: \(\frac{1}{3}=0.333...\) is non-terminating but rational. An irrational decimal is non-terminating and non-recurring. Exam tip: check recurrence too.

Related tags

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

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