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3\sqrt{2}\times \frac{1}{\sqrt{6}}
Factor 18=3^{2}\times 2. Rewrite the square root of the product \sqrt{3^{2}\times 2} as the product of square roots \sqrt{3^{2}}\sqrt{2}. Take the square root of 3^{2}.
3\sqrt{2}\times \frac{\sqrt{6}}{\left(\sqrt{6}\right)^{2}}
Rationalize the denominator of \frac{1}{\sqrt{6}} by multiplying numerator and denominator by \sqrt{6}.
3\sqrt{2}\times \frac{\sqrt{6}}{6}
The square of \sqrt{6} is 6.
\frac{\sqrt{6}}{2}\sqrt{2}
Cancel out 6, the greatest common factor in 3 and 6.
\frac{\sqrt{6}\sqrt{2}}{2}
Express \frac{\sqrt{6}}{2}\sqrt{2} as a single fraction.
\frac{\sqrt{2}\sqrt{3}\sqrt{2}}{2}
Factor 6=2\times 3. Rewrite the square root of the product \sqrt{2\times 3} as the product of square roots \sqrt{2}\sqrt{3}.
\frac{2\sqrt{3}}{2}
Multiply \sqrt{2} and \sqrt{2} to get 2.
\sqrt{3}
Cancel out 2 and 2.