A box contains ten bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that at least one bulb is good?  Select:
A) 1/6  B) 16/625  C) 609/625  D) 5/6  E) 18/263
Required probability   = 1 - 16/625   = 609/625   Answer: 609/625
<result>C</result>
A box contains ten bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that at least one bulb is good?