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This is a MCQ question and the answer is below. However, I am unsure about how the answer is derived? Please explain. Thanks and much

This is a MCQ question and the answer is below. However, I am unsure about how the answer is derived? Please explain. Thanks and much appreciated

Consider an experiment in which the sample space contains the following outcomes 1, 2, 3, 4. Event A is defined as the set containing 1, 2, 3, and event B is defined as containing 3, 4. Which of the following statements is true in this situation?

Answer: The sum of the probabilities of events A and B does not necessarily add to 1.

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