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A student calls the number \(0.101001000100001\ldots\) rational because it contains only the digits 0 and 1. Which conclusion about this number is correct?

Answer and explanation

Correct answer: It is a non-terminating non-recurring decimal, so it is irrational.

In the decimal expansion \(0.101001000100001\ldots\), the number of zeros between successive 1s keeps increasing, so no fixed block repeats regularly. Hence it is a non-terminating, non-recurring decimal and therefore irrational. The use of only the digits 0 and 1 does not make a number rational. Exam tip: a decimal is rational only if it terminates or eventually repeats a fixed pattern.

Related tags

Real NumbersIrrational NumbersDecimal ExpansionRational NumbersNumber SystemsMathematicsClass 9 Mcq

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