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A student says that 0.101001000100001… is rational because it contains only the digits 0 and 1. What is the correct evaluation of this statement?

Answer and explanation

Correct answer: It is irrational because the number of zeros between successive 1s keeps increasing, so no fixed repeating block is formed.

The zero blocks between successive 1s have lengths 1, 2, 3, 4, …, so no fixed block repeats. It is a non-terminating, non-recurring decimal and hence irrational. Exam tip: check repetition, not just the digits used.

Related tags

Irrational NumbersDecimal ExpansionNon-Recurring DecimalsNumber SystemsMisconception CheckMathematicsClass 9 Mcq

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