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How many different 4-letter North American radio station call signs (like CKUL, KNBC, WCBS, and XTHO) can be made if the first letter must be C or K or W or X and none of the letters may be repeated?
Statistics and Probability, Statistics
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Ages of CEOs of companies throughout the United States, and answer the questions that follow. Event A : CEO is under 40 Event B : CEO is at least 30 Event C : CEO is in his or her 50s Event D : CEO is under 60 1. Even ...
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