Intersection or Multiplication

Consider an experiment that in N trials, evenLs A and B occur together N(A B) times, and event B occurs N(B) times. The conditional probability of A given B is equation 2.4-i or 2.4-2. Rearranging, results in equation 2.4-3. 

The rule for combining independent probabilities in intersection is to multiply them together (equation 2.4-5). 

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