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Question
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.
Options:
A .  $$\frac{{62}}{{63}}$$
B .  $$\frac{{125}}{{126}}$$
C .  $$\frac{{1}}{{63}}$$
D .  $$\frac{{1}}{{126}}$$
Answer: Option D

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