When do I use P(A∪B) = P(A)+P(B)−P(A∩B) in Probability, and what does it mean?
the addition rule.
P(A∪B) = P(A)+P(B)−P(A∩B) — the addition rule. Use it when: any two events. Always check the condition holds before plugging in numbers.
Key point
P(A∪B) = P(A)+P(B)−P(A∩B)
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