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Which type of decimal is not a rational number?

Answer and explanation

Correct answer: Non-terminating and non-repeating decimal

A rational number can be written as p/q with integers p and q and q not equal to zero. Its decimal expansion either terminates, such as 0.25 = 1/4, or continues with a repeating pattern, such as 0.666... = 2/3. A non-terminating, non-repeating decimal has no finite ending and no recurring block of digits; it cannot be expressed as a ratio of two integers, so it is irrational. Therefore option C is correct. A terminating decimal is rational, and a repeating decimal is also rational. Zero is rational because 0 = 0/1, so option D is not correct.

Related tags

Decimal RepresentationRational NumbersIrrational NumbersNumber SystemsMathematicsClass 9 Mcq

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