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# Compound events

Sometimes, we need to deal with two or more events. These are called compound events. A compound event is any event that combines two or more simple events. When this happens, we need some special notation.

Given events A and B:

• The probability that A and B occur is P(A ∩ B) = P(A and B)
• The probability that either A or B occurs is P(A B) = P(A or B)

Understanding why we use set notation for these compound events is very important. Remember how we represented events in a universe using circles earlier? Let's say that our Universe is 100 people who showed up for an experiment, in which a new test for cancer is being developed:

In the ...

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