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.
Options:
(A) 125/127
(B) 127/125
(C) 125/126
(D) 126/125
(E) 126/127 OK. Let's think. Some random thoughts first:
Required probability = 1 - 1/126 = 125/126 The answer: (C).