$$\frac{ { 3 }^{ -5 } \times { 3 }^{ -2 } \times { 3 }^{ 3 } }{ { 3 }^{ 8 } \times { 3 }^{ 6 } }$$
$\frac{1}{387420489}\approx 2.581174792 \cdot 10^{-9}$
$$\frac{3^{-7}\times 3^{3}}{3^{8}\times 3^{6}}$$
$$\frac{3^{-4}}{3^{8}\times 3^{6}}$$
$$\frac{3^{-4}}{3^{14}}$$
$$\frac{1}{3^{18}}$$
$$\frac{1}{387420489}$$
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$\frac{1}{3 ^ {18}} = 2.581174791713197 \times 10^{-9}$
