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Let \(r\) be a rational number and \(x\) be an irrational number. Which of the following conclusions is always true?

Answer and explanation

Correct answer: \(r+x\) is an irrational number.

If \(r+x\) were rational, subtracting the rational number \(r\) would make \(x\) rational, a contradiction. Hence A is correct. Option B is also false because the difference remains irrational. Use contradiction in such questions.

Related tags

Irrational NumbersRational NumbersNumber SystemsProperties Of NumbersProof By ContradictionMathematicsClass 9 Mcq

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