Which of the following is irrational?

\sqrt{81}

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\sqrt{\frac{4}{9}}

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\sqrt{7}

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\frac{4}{5}

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Solution

The correct option is C $\sqrt{7}$
$\sqrt{7}$ is irrational number
$\sqrt{\frac{4}{9}} = \frac{2}{3}$ and $\sqrt{81} = 9$

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