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What is the decimal expansion of an irrational number like?

Answer and explanation

Correct answer: Non-terminating and non-repeating

An irrational number cannot be expressed as a ratio of two integers, so its decimal expansion neither terminates nor becomes periodic. Examples: √2 = 1.41421356… and π = 3.14159265… are non-terminating and non-repeating. Option C (non-terminating and repeating) describes typical rational decimals such as 1/3 = 0.333…, so C is incorrect. Exam tip: Check the decimal expansion — if it terminates or eventually repeats the number is rational; if it is non-terminating and non-repeating, it is irrational.

Related tags

Decimal-ExpansionIrrational-NumbersReal-NumbersNumber-ClassificationIrrational Numbers And Real NumbersPolynomialsMathematicsClass 10 Mcq

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