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\sqrt{21}\sqrt{15+2}\sqrt{\frac{2\times 3+2}{3}}\times \frac{1}{2}
Subtract 3 from 24 to get 21.
\sqrt{21}\sqrt{17}\sqrt{\frac{2\times 3+2}{3}}\times \frac{1}{2}
Add 15 and 2 to get 17.
\sqrt{21}\sqrt{17}\sqrt{\frac{6+2}{3}}\times \frac{1}{2}
Multiply 2 and 3 to get 6.
\sqrt{21}\sqrt{17}\sqrt{\frac{8}{3}}\times \frac{1}{2}
Add 6 and 2 to get 8.
\sqrt{21}\sqrt{17}\times \frac{\sqrt{8}}{\sqrt{3}}\times \frac{1}{2}
Rewrite the square root of the division \sqrt{\frac{8}{3}} as the division of square roots \frac{\sqrt{8}}{\sqrt{3}}.
\sqrt{21}\sqrt{17}\times \frac{2\sqrt{2}}{\sqrt{3}}\times \frac{1}{2}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
\sqrt{21}\sqrt{17}\times \frac{2\sqrt{2}\sqrt{3}}{\left(\sqrt{3}\right)^{2}}\times \frac{1}{2}
Rationalize the denominator of \frac{2\sqrt{2}}{\sqrt{3}} by multiplying numerator and denominator by \sqrt{3}.
\sqrt{21}\sqrt{17}\times \frac{2\sqrt{2}\sqrt{3}}{3}\times \frac{1}{2}
The square of \sqrt{3} is 3.
\sqrt{21}\sqrt{17}\times \frac{2\sqrt{6}}{3}\times \frac{1}{2}
To multiply \sqrt{2} and \sqrt{3}, multiply the numbers under the square root.
\sqrt{357}\times \frac{2\sqrt{6}}{3}\times \frac{1}{2}
To multiply \sqrt{21} and \sqrt{17}, multiply the numbers under the square root.
\frac{\sqrt{21}\times 2\sqrt{6}}{3}\times \frac{1}{2}
Express \sqrt{21}\times \frac{2\sqrt{6}}{3} as a single fraction.
\frac{\sqrt{21}\times 2\sqrt{6}}{3\times 2}
Multiply \frac{\sqrt{21}\times 2\sqrt{6}}{3} times \frac{1}{2} by multiplying numerator times numerator and denominator times denominator.
\frac{\sqrt{6}\sqrt{21}}{3}
Cancel out 2 in both numerator and denominator.
\frac{\sqrt{126}}{3}
To multiply \sqrt{6} and \sqrt{21}, multiply the numbers under the square root.
\frac{3\sqrt{14}}{3}
Factor 126=3^{2}\times 14. Rewrite the square root of the product \sqrt{3^{2}\times 14} as the product of square roots \sqrt{3^{2}}\sqrt{14}. Take the square root of 3^{2}.
\sqrt{14}
Cancel out 3 and 3.