What subset, A, of the sample space represents the complement of the event in which Camille is the final swimmer?

The sample space lists all possible swimming orders using A, B, and C. The event that Camille (C) is the final swimmer consists of orders ending in C: ABC and BAC. Its complement contains the remaining orders, where C is not last: CBA, CAB, BCA, and ACB. Therefore, the correct choice is A = {CBA, CAB, BCA, ACB}, choice A.

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