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How is (0.312312312\ldots) written in bar notation?

Answer and explanation

Correct answer: \(0.\overline{312}\)

In the decimal 0.312312312…, the three-digit block 312 repeats continuously. Therefore, the bar must be placed over the complete repeating block: \(0.\overline{312}\). In \(0.3\overline{12}\), only 12 is treated as repeating, which does not match the given decimal pattern. Exam tip: Before using bar notation, identify the shortest block that repeats continuously.

Related tags

Number SystemsDecimal RepresentationRecurring DecimalsBar NotationRational NumbersMathematicsClass 9 Mcq

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