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Which is the correct bar notation of (0.34090909\ldots)?

Answer and explanation

Correct answer: \(0.34\overline{09}\)

The decimal digits are 3, 4, 0, 9, 0, 9, \(\ldots\). After 34, the block 09 repeats continuously, so the correct notation is \(0.34\overline{09}\). In \(0.\overline{3409}\), the entire block 3409 is incorrectly treated as repeating from the beginning. Exam tip: Before placing a bar, identify the smallest block of digits that repeats indefinitely.

Related tags

Number SystemsDecimal RepresentationRecurring DecimalsBar NotationRational NumbersMathematicsClass 9 Mcq

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