$$5/280 \div 5/280 \div 5/280$$
$\frac{1}{109760000}\approx 9.110787172 \cdot 10^{-9}$
$$\frac{\frac{\frac{\frac{5}{280}}{5}}{280}}{5\times 280}$$
$$\frac{\frac{\frac{5}{280}}{5\times 280}}{5\times 280}$$
$$\frac{\frac{\frac{1}{56}}{5\times 280}}{5\times 280}$$
$$\frac{\frac{\frac{1}{56}}{1400}}{5\times 280}$$
$$\frac{\frac{1}{56\times 1400}}{5\times 280}$$
$$\frac{\frac{1}{78400}}{5\times 280}$$
$$\frac{\frac{1}{78400}}{1400}$$
$$\frac{1}{78400\times 1400}$$
$$\frac{1}{109760000}$$
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$\frac{1}{2 ^ {9} \cdot 5 ^ {4} \cdot 7 ^ {3}} = 9.110787172011662 \times 10^{-9}$
