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.(adsbygoogle = window.adsbygoogle || []).push({});

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?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Probability intersections

**Physics Forums | Science Articles, Homework Help, Discussion**