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Reema claims that the sum of two irrational numbers is always irrational. Which of the following examples disproves her claim?

Answer and explanation

Correct answer: \(\sqrt{3}+(-\sqrt{3})=0\)

Both \(\sqrt{3}\) and \(-\sqrt{3}\) are irrational, but their sum is \(0\), a rational number. Hence the word “always” makes the claim false. Exam tip: one counterexample is enough to disprove a universal statement.

Related tags

Irrational NumbersNumber SystemsCounterexampleAddition Of IrrationalsStatement EvaluationGrade 9 MathematicsMathematicsClass 9 Mcq

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