There are 7 people taking part in a raffle. Ann, Bob, Elsa, Hans, Kira, Ravi, and Soo. Suppose that prize winners are randomly selected from the 7 people. Compute the probability of each of the following events. Event A: The first four prize winners are Ann, Hans, Bob, and Kira, regardless of order. Event B: Elsa is the first prize winner, Hans is second, Bob is third, and Soo is fourth.

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A: Given that 7 people taking part in a raffle. Ann, Bob, Elsa, Jim, Kira, Omar, and Soo

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