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A sphere increases its volume at the rat...

A sphere increases its volume at the rate of `picc//s`. The rate at which its surface area increases when the radius is 1 cm is

A

`2pi` sq. cm/s

B

`pi sq.` cm/s

C

`(3pi)/(2)` sq. cm/s

D

`(pi)/(2)` sq. cm/s

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