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Sara, Tyrone, Sergio, Eduardo, Simone, Katrina, and Larry have allbeen invited to a dinner party. They arrive randomly and each person arrives at a different

Sara, Tyrone, Sergio, Eduardo, Simone, Katrina, and Larry have allbeen 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 Sara arrive first and Larry last?

c. Find the probability that Sarah will arrive first and Larry last?

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