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Which option correctly shows the meaning of 0.̅12?

Answer and explanation

Correct answer: 0.121212…

The governing concept is recurring-decimal notation. A bar placed over a group of digits means that the entire group, not merely its last digit, repeats endlessly immediately after the decimal point. Therefore 0.̅12 means 0.12121212…, so option A is correct. Option B represents the terminating decimal 0.12, followed by zeros, and contains no repeated block 12. Option C begins with 11, so its decimal pattern is different. Option D begins with 012 and likewise does not match the indicated notation. Reading the complete block under the bar is essential. The same value can also be written as 12/99, which simplifies to 4/33, confirming that it is a recurring rational decimal.

Related tags

Number SystemsRecurring DecimalBar NotationDecimal RepresentationMathematicsClass 9 Mcq

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