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13. Explain, why you have to multiply the probability of X and the probability of Y,...

13. Explain, why you have to multiply the probability of X and the probability of Y, when you want to calculate a probability of both X and Y occurring together. For example, the probability of obtaining an A grade in both the midterm and the final exam using an example AND/OR diagram.

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This is simple example of operation between two events in probability theory.

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