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What is the recurring part of (6.020202\ldots)?

Answer and explanation

Correct answer: (02)

In a decimal expansion, the recurring part is the smallest group of digits that repeats endlessly in exactly the same order. The number before the decimal point is the whole-number part, not part of the repeating block. Also, a repeated block may begin with zero, so that zero must not be dropped when identifying the pattern.

In \(6.020202\ldots\), the digits after the decimal point are 0, 2, 0, 2, 0, 2, and so on. They can be grouped as \(02\mid02\mid02\ldots\). Thus the repeating block is (02), not (20), because the first digit of the decimal part is 0 and the order is important. The digit 6 does not repeat, and (202) is not the smallest repeating group. Therefore option B is correct.

Related tags

Number-SystemsDecimal-RepresentationRepeating-Block

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