$$\frac{ 1 }{ 7 } \times \frac{ 1 }{ 9 }$$
$\frac{1}{63}\approx 0.015873016$
$$\frac{1\times 1}{7\times 9}$$
$$\frac{1}{63}$$
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$\frac{1}{3 ^ {2} \cdot 7} = 0.015873015873015872$
