Which of the following is a rational number?
√81
√45
√77
√99
Which of the following is a rational number?
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The correct answer is √81.
Explanation: A rational number is defined as a number that can be expressed as the quotient of two integers (a fraction). The square root of 81 is 9, which is an integer. Therefore, √81 is a rational number. In contrast, √45, √77, and √99 are not integers and cannot be expressed as simple fractions, making them irrational numbers.