A box contains six 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 correct choice from the following options:
A) 125/167
B) 14/15
C) 125/126
D) 125/186
E) 125/128
Required probability   = 1 - 1/15   = 14/15   Answer: 14/15
<result>B</result>
A box contains six bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good.