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The radius of a spherical balloon increa...

The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. The ratio of surface area of the balloon in the two cases is :

A

4 : 1

B

1 : 4

C

3 : 1

D

1 : 2

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MBD-Surface Areas and Volumes-Exercise
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