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Question
Which of the following is irrational?
Options
\[\sqrt{\frac{4}{9}}\]
\[\sqrt{\frac{4}{5}}\]
\[\sqrt{7}\]
\[\sqrt{81}\]
Solution
Given that
`sqrt4/9 = 2/3`
`4/5 = 0.8`
`sqrt81 9`
And 7 is not a perfect square.
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