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.  Select
A) 125/128 B) 125/125 C) 125/126 D) 125/121 E) 125/122
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.