Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
The probability that event A or event B or both will occur equals the sum of their individual probabilities minus the probability that both occur: P(A ∪ B) = P(A) + P(B) - P(A ∩ B).
AP course connection
Topic 4.6: 4.6 Independent Events and Unions of Events