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.

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

1.	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.
A.	20/31
B.	20/63
C.	5/31
D.	6/31
Answer» C. 5/31

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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.

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