$$\frac{ { 5 }^{ 2 } }{ { 140 }^{ 2 } }$$
$\frac{1}{784}\approx 0.00127551$
$$\frac{25}{140^{2}}$$
$$\frac{25}{19600}$$
$$\frac{1}{784}$$
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$\frac{1}{2 ^ {4} \cdot 7 ^ {2}} = 0.0012755102040816326$
