Set Theory: Show that P(A U B) = P(A) + P(Ac ∩ B)?
Answer P(A U B) = P(A) + P(Ac ∩ B)? Here is a simple but understandable approach. The method below is called the “counting argument” in combinatorics and probability. Since we have “two events” A & B, lets define the number of elements as follows : A has ‘a’ elements. We write A =...
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