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The radius of hemispherical balloon increases from 6cm to 12 cm as air is being pumped into it. The ratio of the surface areas of the balloons in two

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The radius of hemispherical balloon increases from 6cm to 12 cm as air is being pumped into it. The ratio of the surface areas of the balloons in two cases is
A. `1 : 4`
B. `1 : 3`
C. `2 : 3`
D. `1 : 2`
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Correct Answer - A
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