$$\frac{ 68 }{ 20 \times 6888888888 }$$
$\frac{17}{34444444440}\approx 4.935483872 \cdot 10^{-10}$
$$\frac{68}{137777777760}$$
$$\frac{17}{34444444440}$$
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$\frac{17}{2 ^ {3} \cdot 3 \cdot 5 \cdot 7 \cdot 47 \cdot 872453} = 4.935483871604578 \times 10^{-10}$