As air is pumped into a spherical balloon, its radius increa

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As air is pumped into a spherical balloon, its radius increases from 7 cm to 14 cm.
Find the ratio of volume of the balloon's in both circumstances.

[SSC CHSL 27th May 2022 Shift-1 With Answers]

A

2 : 5

B

1 : 9

C

1 : 8

D

3 : 7

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