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Illinois license plates used to consist of either three letters followed by three digits or two letters followed by four digits. Assume that all the
Illinois license plates used to consist of either three letters followed by three digits or two letters followed by four digits. Assume that all the different possible license plates are equally likely.
(a) What is the probability that a randomly chosen plate contains the number9999? (Round your answer to six decimal places.)
(b) What is the probability that a randomly chosen plate contains the substringWE? (For example,WE4321orPWE786are two waysWEmight appear. Round your answer to six decimal places.)
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