The radius of a spherical balloon is inflated from \( 1.5 \mathrm{~cm} \) to \( 2.5 \mathrm{~cm}...

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The radius of a spherical balloon is inflated from \( 1.5 \mathrm{~cm} \) to \( 2.5 \mathrm{~cm} \) by pumping more air in it. Find the ratio of surface area of resulting balloon to the original balloon.
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