A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective  Choices
A) 1/128	B) 1/121	C) 1/120	D) 1/123	E) 1/126
Explanation:   Out of nine, five are good and four are defective. Required probability = 4C4/9C4 = 1/126   Answer: 1/126
<result>E</result>
A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective