A box contains eight bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly three bulbs are good?
Choose the correct choice:
A) 10/35 B) 11/35 C) 9/35 D) 8/35 E) 6/35
Required probability = (4C3 . 4C1)/8C4 = (4 * 4)/70   = 8/35   Answer:8/35
<result>D</result>
A box contains eight bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly three bulbs are good?