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So the the example in the book says that A is the event that a person lives at least ninty years and B is the event that a person lives at least 80 years.
Then it says that P(AB) = P (A) and that the overlap is "at least 90" which is A. But how could 90 which is larger be an intersection of 80?
Then it says that P(AB) = P (A) and that the overlap is "at least 90" which is A. But how could 90 which is larger be an intersection of 80?