$$\frac{7^{-3}}{7^{5}}$$
$\frac{1}{5764801}\approx 0.000000173$
$$\frac{1}{7^{8}}$$
$$\frac{1}{5764801}$$
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$\frac{1}{7 ^ {8}} = 1.7346652555743034 \times 10^{-7}$
