A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good.  Choices.
A) 60/63	B) 125/126	C) 1/126	D) 8/178	E) 9/191
Explanation:   Required probability = 1 - 1/126 = 125/126   ANSWER 125/126
<result>B</result>
A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good.