# 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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