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In which option are all numbers rational?

Answer and explanation

Correct answer: 0.125, 0.777..., 2.3434...

A rational number can be written as a fraction of integers. Its decimal expansion either terminates or continues with a repeating block. In option A, 0.125 terminates, 0.777... repeats the digit 7, and 2.3434... repeats the block 34; therefore all three are rational. Hence option A is correct. In option B, 0.1010010001... has a non-repeating pattern, so it is irrational even though 0.25 and 1.5 are rational. Option C contains a non-repeating expansion of pi, which is irrational. Option D also begins a non-terminating, non-repeating pattern, so not all its numbers are rational. The presence of a decimal alone is not enough; its pattern must be checked.

Related tags

Decimal-RepresentationRational-And-Irrational-NumbersRecurring-DecimalsDecimal RepresentationNumber SystemsMathematicsClass 9 Mcq

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