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Kim, Simone, Jim, and Sergio have all been invited to a dinner party. They arrive randomly and each person arrives at a different time. a.

Kim, Simone, Jim, 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 Kim arrive first and Sergio last?

c. Find the probability that Kim will arrive first and Sergio last.

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