A box contains seven 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 answers
A) 34/35  B) 125/186  C) 125/126  D) 125/186  E) 125/128
Required probability   = 1 - 1/35   = 34/35   34/35nswer: 34/35
<result>A</result>
A box contains seven bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that atleast one bulb is good.