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If 0.1010010001... has no repeating pattern, what is it?

Answer and explanation

Correct answer: Irrational real number

The governing concept is the decimal test for rational and irrational numbers. A real number is rational when it can be written as p/q, with integers p and q and q non-zero; its decimal expansion terminates or eventually repeats. The given expansion continues indefinitely and, as stated, has no repeating pattern. Therefore it cannot be represented as a ratio of integers and is irrational. It remains a real number because every such decimal denotes a point on the real number line. Option C is correct. It cannot be an integer or natural number, since those have whole-number values and terminating decimal forms, and it is not rational because no repetition occurs.

Related tags

Real NumbersIrrational NumbersNon-Repeating DecimalNumber SystemsMathematicsClass 9 Mcq

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