Sarah, lan, Dawn, and Sergio have all been invited to a dinner party. They arrive randomly and each person arrives at a

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answerhappygod
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Sarah, lan, Dawn, and Sergio have all been invited to a dinner party. They arrive randomly and each person arrives at a

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Sarah, lan, Dawn, and Sergio have all been invited to a dinner party. They arrive randomly and each person arrives at a different time. a. In how many ways can they arrive? b. In how many ways can Sarah arrive first and Sergio last? c. Find the probability that Sarah will arrive first and Sergio last.
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