$$(\frac{3}{8})^{2}(\frac{7}{8})^{3}(\frac{5}{6})^{3}$$
$\frac{42875}{786432}\approx 0.054518382$
$$\frac{9}{64}\times \left(\frac{7}{8}\right)^{3}\times \left(\frac{5}{6}\right)^{3}$$
$$\frac{9}{64}\times \frac{343}{512}\times \left(\frac{5}{6}\right)^{3}$$
$$\frac{9\times 343}{64\times 512}\times \left(\frac{5}{6}\right)^{3}$$
$$\frac{3087}{32768}\times \left(\frac{5}{6}\right)^{3}$$
$$\frac{3087}{32768}\times \frac{125}{216}$$
$$\frac{3087\times 125}{32768\times 216}$$
$$\frac{385875}{7077888}$$
$$\frac{42875}{786432}$$
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$\frac{5 ^ {3} \cdot 7 ^ {3}}{2 ^ {18} \cdot 3} = 0.05451838175455729$