Answer
$\displaystyle\frac{\sqrt{6}}{2}$
Work Step by Step
We multiply the numerator and denominator by $\sqrt{6}$ to simplify:
$\displaystyle \frac{3}{\sqrt{6}}=\frac{3}{\sqrt{6}}*\frac{\sqrt{6}}{\sqrt{6}}=\frac{3\sqrt{6}}{6}=\frac{\sqrt{6}}{2}$