$\dfrac{3}{\sqrt{7}}$ rationalised is

$\dfrac{3}{\sqrt{7}}$ rationalised is
  1. $\dfrac{3\sqrt{7}}{7}$
  2. $\dfrac{3}{7}$
  3. $3\sqrt{7}$
  4. $\dfrac{\sqrt{21}}{7}$

Solution

Multiply by $\dfrac{\sqrt{7}}{\sqrt{7}}$.

Asked in: MH-SSC-9

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