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Which is the correct bar notation of (0.036036036\ldots)?

Answer and explanation

Correct answer: \(0.\overline{036}\)

In \(0.036036036\ldots\), the digit block \(036\) repeats continuously. Therefore, the bar must be placed over the complete recurring block: \(0.\overline{036}\). In \(0.0\overline{36}\), only \(36\) repeats, giving \(0.0363636\ldots\), which is different from the given decimal. Exam tip: identify the smallest complete repeating block before placing the bar.

Related tags

Number SystemsDecimal RepresentationRecurring DecimalsBar NotationRational NumbersMathematicsClass 9 Mcq

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