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Which decimal represents an irrational number?

Answer and explanation

Correct answer: \(0.123456789101112\ldots\)

In \(0.123456789101112\ldots\), the digits of natural numbers are written consecutively, and no fixed block of digits repeats forever. It is an infinite non-repeating decimal, so it is irrational. In contrast, \(0.7777\ldots\), \(0.202020\ldots\), and \(0.123123123\ldots\) are recurring decimals and therefore rational. Exam tip: An infinite decimal is rational if it eventually repeats; if it is non-terminating and non-repeating, it is irrational.

Related tags

Irrational NumbersReal NumbersNon-Terminating DecimalsNon-Repeating DecimalsRecurring DecimalsNumber SystemsMathematicsClass 9 Mcq

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