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A case of light bulbs...

A case of light bulbs has twenty bulbs, four of which are defective. If three of the bulbs are randomly selected without replacement, what is the probability that the first two are good and the last one is defective?

Using the same information from the problem above what is the probability that all three bulbs will be good?

Using the same information from the problem above what is the probability that all three bulbs will be good?

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