Student: 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.\nOptions:\n(A) 125/127\n(B) 127/125\n(C) 125/126\n(D) 126/125\n(E) 126/127.
Another student: Let's say, hmmm...

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Required probability = 1 - 1/126 = 125/126 Final answer: (C).
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