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What is the recurring part of (2.909090\ldots)?

Answer and explanation

Correct answer: \(90\)

After the decimal point, the digits are \(9,0,9,0,\ldots\). The digit \(9\) is followed by \(0\), and this two-digit block repeats continuously; therefore, the recurring part is \(90\). The digit \(9\) alone is not the repeating block because it is followed by \(0\) each time. Exam tip: identify the shortest block after the decimal point that repeats in the same order.

Related tags

Number SystemsDecimal RepresentationRecurring DecimalsRepeating BlockIrrational NumbersMathematicsClass 9 Mcq

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