$$\frac{ 4 }{ 15 } \times ( \frac{ 1 }{ 4 } \times \frac { 5 } { 6 } )$$
$\frac{1}{18}\approx 0.055555556$
$$\frac{4\times 1}{15\times 4}\times \frac{5}{6}$$
$$\frac{1}{15}\times \frac{5}{6}$$
$$\frac{1\times 5}{15\times 6}$$
$$\frac{5}{90}$$
$$\frac{1}{18}$$
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$\frac{1}{2 \cdot 3 ^ {2}} = 0.05555555555555555$
