A box contains nine bulbs out of which 3 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good. Choose the correct choice from the following answers.
A) 125/167	B) 125/186	C) 83/84	D) 125/186	E) 125/128
Required probability   = 1 - 1/84   = 83/84   Answer: 83/84
<result>C</result>
A box contains nine bulbs out of which 3 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good.