Which of the following irrational number lies between 20 and 21

\sqrt{4} 42

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\sqrt{4} 40

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\sqrt{4} 43

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\sqrt{4} 44

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Solution

The correct option is B $\sqrt{4} 40$
$20^{2} = 400, 21^{2} = 441 \Rightarrow 400 < 440 < 441 \Rightarrow 20 < \sqrt{440} < 21$

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