$$\frac{ { 4 }^{ 2 } }{ { 7 }^{ 2 } { 8 }^{ 2 } { 9 }^{ 2 } }$$
$\frac{1}{15876}\approx 0.000062988$
$$\frac{16}{7^{2}\times 8^{2}\times 9^{2}}$$
$$\frac{16}{49\times 8^{2}\times 9^{2}}$$
$$\frac{16}{49\times 64\times 9^{2}}$$
$$\frac{16}{3136\times 9^{2}}$$
$$\frac{16}{3136\times 81}$$
$$\frac{16}{254016}$$
$$\frac{1}{15876}$$
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$\frac{1}{2 ^ {2} \cdot 3 ^ {4} \cdot 7 ^ {2}} = 6.298815822625347 \times 10^{-5}$
