$$\frac{.49\times2^{-3}}{7^{3}\times10\times2^{-5}}$$
$\frac{1}{1750}\approx 0.000571429$
$$\frac{0.49\times 2^{2}}{10\times 7^{3}}$$
$$\frac{0.49\times 4}{10\times 7^{3}}$$
$$\frac{1.96}{10\times 7^{3}}$$
$$\frac{1.96}{10\times 343}$$
$$\frac{1.96}{3430}$$
$$\frac{196}{343000}$$
$$\frac{1}{1750}$$
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$\frac{1}{2 \cdot 7 \cdot 5 ^ {3}} = 0.0005714285714285715$