If A and B are independent events, P(A or B) = P(A) + P(B) - P(A) ° P(B).

Name: If A and B are independent events, P(A or B) = P(A) + P(B) - P(A) ° P(B).
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For independent events A and B, the probability of A or B occurring is given by P(A or B) = P(A) + P(B) - P(A) * P(B), because the intersection of A and B (A and B happening together) is accounted for by subtracting P(A) * P(B).

If a and B Are Independent Events, P(A or B)