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

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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 exactly three bulbs are good.

Options:

A . $$\frac{{20}}{{31}}$$

B . $$\frac{{20}}{{63}}$$

C . $$\frac{{5}}{{31}}$$

D . $$\frac{{6}}{{31}}$$

Answer: Option B

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