Calculus and Above

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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?10. Using the same information from problem #9, what is the probability that all three bulbs will be good?11. In a class containing 25 males and 22 females, two different test papers were selected at random. What is the probability that the first test paper was from a female and the second was from a male?12. Using the same information from problem #11, what is the probability that both test papers belong to females? 25/47=.53113. A scientific study is being done on ten guinea pigs, six of which are pregnant. If three different guinea pigs are randomly selected, what is the probability that they are all pregnant?14. Using the same information from problem #14, what is the probability that none of the guinea pigs selected are pregnant?

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