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A student classifies the number 0.101001000100001… as rational because it contains only the digits 0 and 1. Which is the correct evaluation of the student's conclusion?

Answer and explanation

Correct answer: The conclusion is wrong; it is irrational because it is non-terminating and non-repeating

A number is rational only when its decimal expansion is either terminating or repeating in a fixed pattern. In 0.101001000100001…, the number of zeros between successive 1s keeps increasing, so no fixed block repeats and the decimal expansion does not terminate. Therefore, the number is irrational. Merely using the digits 0 and 1 does not make a number rational. Exam tip: terminating or recurring decimals are rational; non-terminating, non-recurring decimals are irrational.

Related tags

Real NumbersRational NumbersIrrational NumbersDecimal ExpansionNumber SystemsMathematicsClass 9 Mcq

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