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100\sqrt{\frac{6}{6!}}
The factorial of 3 is 6.
100\sqrt{\frac{6}{720}}
The factorial of 6 is 720.
100\sqrt{\frac{1}{120}}
Reduce the fraction \frac{6}{720} to lowest terms by extracting and canceling out 6.
100\times \frac{\sqrt{1}}{\sqrt{120}}
Rewrite the square root of the division \sqrt{\frac{1}{120}} as the division of square roots \frac{\sqrt{1}}{\sqrt{120}}.
100\times \frac{1}{\sqrt{120}}
Calculate the square root of 1 and get 1.
100\times \frac{1}{2\sqrt{30}}
Factor 120=2^{2}\times 30. Rewrite the square root of the product \sqrt{2^{2}\times 30} as the product of square roots \sqrt{2^{2}}\sqrt{30}. Take the square root of 2^{2}.
100\times \frac{\sqrt{30}}{2\left(\sqrt{30}\right)^{2}}
Rationalize the denominator of \frac{1}{2\sqrt{30}} by multiplying numerator and denominator by \sqrt{30}.
100\times \frac{\sqrt{30}}{2\times 30}
The square of \sqrt{30} is 30.
100\times \frac{\sqrt{30}}{60}
Multiply 2 and 30 to get 60.
\frac{100\sqrt{30}}{60}
Express 100\times \frac{\sqrt{30}}{60} as a single fraction.
\frac{5}{3}\sqrt{30}
Divide 100\sqrt{30} by 60 to get \frac{5}{3}\sqrt{30}.