$$( \frac { 2 } { 5 } ) ^ { 20 } \times ( \frac { 2 } { 5 } ) ^ { 30 }$$
$\frac{1125899906842624}{88817841970012523233890533447265625}=1.2676506 \cdot 10^{-20}$
$$\left(\frac{2}{5}\right)^{50}$$
$$\frac{1125899906842624}{88817841970012523233890533447265625}$$
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$\frac{2 ^ {50}}{5 ^ {50}} = 1.2676506002282293 \times 10^{-20}$
