A box contains nine bulbs out of which 4 are defective. If four bulbs are chose

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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.

Answer: Option E

Out of nine, five are good and four are defective.
Required probability = â´Câ‚„/â¹Câ‚„ = 1/126

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