Exclusive Or The formal addition rule expressed the probability of A or B as follows:

P1A or B2 = P1A2 + 1B2 - P1A and B2. The exclusive or means either one or the other events occurs, but not both. Rewrite the expression for P(A or B) assuming that the addition rule uses the exclusive or instead of the inclusive or. (Hint: Draw a Venn diagram.)