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A spherical balloon is being inflated at...

A spherical balloon is being inflated at the rate of 35 cc//min. The rate of increase of the surface area of the balloon when its diameter is 14 cm is...

A

7 sq.cm/min

B

10 sq.cm/min

C

17.5 cm/min

D

28 sq.cm/min

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The correct Answer is:
B
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