5. Rationalise the denominators of the following:

    (i)     \frac{1}{\sqrt{7}}

Answers (1)

Given number is  \frac{1}{\sqrt{7}}

Now, on rationalisation, we will get 

\Rightarrow \frac{1}{\sqrt 7} = \frac{1}{\sqrt 7}\times \frac{\sqrt 7}{\sqrt 7 } = \frac{\sqrt7}{7}

Therefore, the answer is  \frac{\sqrt7}{7}

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