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If √n lies between 6 and 7 on the number line, which value of n is possible?

Answer and explanation

Correct answer: 40

The governing concept is the increasing nature of the square-root function for non-negative numbers. From 6<√n<7, square all three parts; because all quantities are positive, the inequality direction is preserved: 36<n<49. Now test the choices. Values 30 and 35 are below 36, while 50 is above 49. Only 40 lies strictly between 36 and 49, so n=40 is possible and option C is correct. It is not necessary that n be a perfect square. Indeed, √40 is approximately 6.325, which is genuinely between 6 and 7. Squaring the endpoint bounds is more reliable than checking only the nearby perfect squares.

Related tags

Number-LineSquare-RootsInequalitiesReal-NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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