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) 125/127	B) 127/125	C) 125/126	D) 126/125	E) 126/127
Required probability = 1 - 1/126 = 125/126   Answer: 125/126
<result>C</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.