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Reema says that the decimal number 0.101001000100001... is rational because it uses only the digits 0 and 1. Which is the correct evaluation of her statement?

Answer and explanation

Correct answer: The statement is incorrect; it is an irrational number because its decimal expansion is non-terminating and non-repeating.

A rational number has a terminating or an eventually repeating decimal expansion. In the given number, the number of zeros between successive 1s keeps increasing, so no fixed block of digits repeats. Hence its decimal expansion is non-terminating and non-repeating, making the number irrational. The fact that only two digits are used does not determine rationality. Exam tip: Check whether the decimal terminates or repeats, not merely which digits appear.

Related tags

Real NumbersRational NumbersIrrational NumbersDecimal ExpansionNumber SystemsMathematicsClass 9 Mcq

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