$$\frac{1}{45}\times\frac{9}{39}$$
$\frac{1}{195}\approx 0.005128205$
$$\frac{1}{45}\times \frac{3}{13}$$
$$\frac{1\times 3}{45\times 13}$$
$$\frac{3}{585}$$
$$\frac{1}{195}$$
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$\frac{1}{3 \cdot 5 \cdot 13} = 0.005128205128205128$