Q56.solution pls.
Q.56. A balloon is pumped at the rate of 4 c m 3 per second. What is the rate at which its surface area increases when its radius is 4 cm ?
(A) 1 c m 2 /sec
(B) 2 c m 2 /sec
(C) 3 c m 2 /sec
(D) 4 c m 2 /sec

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