The symmetric difference between two events A and B is the set of all sample points that
Chapter 2, Problem 2.131(choose chapter or problem)
The symmetric difference between two events A and B is the set of all sample points that are in exactly one of the sets and is often denoted A B. Note that A B = (A B) (A B). Prove that P(A B) = P(A) + P(B) 2P(A B).
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