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Surds

Which of the ...

Question

Which of the following is an irrational number?

A

√36

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B

√64

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C

√81

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D

√99

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Solution

The correct option is D
√99

Irrational numbers: Numbers which cannot be written in the form p/q.

$\sqrt{36} = 6$

$\sqrt{64} = 8$

$\sqrt{81} = 9$

$\sqrt{99} = 3 \sqrt{11}$

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