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How many rational numbers are there between any two distinct real numbers?

Answer and explanation

Correct answer: Infinitely many

The direct answer is C, infinitely many. Rational numbers have the density property: between any two distinct real numbers, no matter how close they are, there are infinitely many rational numbers. To understand it, let the two numbers be a and b with a<b. Their average \\(\frac{a+b}{2}\\) lies between them. We can then find more numbers between a and that average, and between the average and b; repeating this process never ends. In this question the endpoints are real numbers, and rational numbers are densely placed throughout the real number line, so infinitely many rational numbers occur between them. Option A, only 1, is wrong because the average already gives one, and more can be found. Option B, only 2, is similarly too small. Option C is correct. Option D, none, is wrong because at least one rational number can be found between any two distinct real numbers, and in fact there are infinitely many. Exam cue: “between any two distinct real numbers” plus “rational numbers” usually tests density, whose answer is infinitely many.

Related tags

Real NumbersDensityRational Numbers

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