A box contains eight bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly two bulbs are good? Choose the correct choice:
A) 3/7 B) 17/35 C) 19/35 D) 16/35 E) 18/35
Required probability = (4C2 . 4C2)/8C4 = (6 * 6)/70   = 18/35   Answer:18/35
<result>E</result>
A box contains eight bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly two bulbs are good?