Two point charges $8 \mu \mathrm{C}$ and $-2 \mu \mathrm{C}$ are located at $x=2 \mathrm{~cm}$ and $x=4 \mathrm{~cm}$, respectively on the $x$ axis. The ratio of electric flux due to these charges through two spheres of radii 3 cm and 5 cm with their centers at the origin is $\_\_\_\_$ ..
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