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What is the recurring part of 5.1020202...?

Answer and explanation

Correct answer: 02

The governing concept is the identification of the repeating block in a recurring decimal. Write the digits after the decimal point in order: 1, 0, 2, 0, 2, 0, 2, and so on. The first digit 1 occurs only once, so it is the non-repeating or initial part. After that, the pair 02 repeats: 5.1 02 02 02... Therefore, the recurring part is 02 and option B is correct. Option C, 20, reverses the order of the repeating digits and would describe a different decimal. Option A is only the initial pair and does not continue periodically. Option D includes the initial non-repeating digit, so it is not the repeating block itself. Sequence order is essential here.

Related tags

Decimal-RepresentationRecurring-DecimalsRepeating-BlockDecimal RepresentationNumber SystemsMathematicsClass 9 Mcq

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