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Which statement is correct about √7?

Answer and explanation

Correct answer: It is irrational

The governing concept is the distinction between perfect-square and non-perfect-square roots. Since 7 is not a perfect square of any integer, √7 cannot be expressed as p/q where p and q are integers and q is non-zero. Therefore √7 is irrational, making option B correct. It is not an integer or a natural number because squaring an integer never gives 7. Option A is also false because rational square roots of integers occur when the integer is a perfect square, such as √9 = 3. The correct test is to check whether the radicand is a perfect square before classifying its square root.

Related tags

Irrational NumbersNumber SystemsSquare RootsMathematicsClass 9 Mcq

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