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A sign on the gas pumps of a chain of gasoline stations encourges customers to have their oil checked, claiming that one out of four

A sign on the gas pumps of a chain of gasoline stations encourges customers to have their oil checked, claiming that one out of four cars need to have oil added. If this is true, what is the probability o the following events?

a. One out of the next four cars needs oil

b. Two out of the next eight cars needs oil

c.Three out of the next 12 cars need oil

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