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. Choose the most appropriate option
A) 125/167	B) 125/186	C) 125/126	D) 125/186	E) 125/128
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.