Which of the following is true? The sum of the probabilities of collectively exhaustive events must equal one. The probabilities of mutually exclusive events which are collectively exhaustive sum to one. If A and B are mutually exclusive, then A⎯⎯⎯A¯and B⎯⎯⎯B¯ must be mutually exclusive. None of the suggested answers are correct. An event and its complement are sometimes mutually exclusive.

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