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Which option is correct about the sum of a rational and an irrational number?

Answer and explanation

Correct answer: Always irrational

Let \(r\) be rational and \(x\) be irrational. Then \(r+x\) must be irrational. If \(r+x\) were rational, then \(x=(r+x)-r\) would be the difference of two rational numbers and hence rational, which is a contradiction. For example, \(3+\sqrt{2}\) is irrational. Therefore, option A is incorrect, and the sum is not necessarily an integer either. Exam tip: the sum or difference of a rational number and an irrational number is always irrational.

Related tags

Number SystemsRational NumbersIrrational NumbersClosure PropertiesMathematicsClass 9 Mcq

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