A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective.\nOptions:\n(A) 62/63\n(B) 125/126\n(C) 1/63\n(D) 1/42\n(E) 1/126 OK. Let's think. Some random thoughts first:
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Answer: Option E\nOut of nine, five are good and four are defective. Required probability = â´câ‚„/â¹câ‚„ = 1/126 The answer: (E).
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