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10 cards from this deck
Events that cannot happen at the same time
P(A∩B)=∅P(A ∩ B) = ∅P(A∩B)=∅
P(A∪B)=P(A)+P(B)P(A ∪ B) = P(A) + P(B)P(A∪B)=P(A)+P(B)
P(A∪B)=P(A)+P(B)−P(A∩B)P(A ∪ B) = P(A) + P(B) - P(A ∩ B)P(A∪B)=P(A)+P(B)−P(A∩B)
Contains all outcomes not in the event
A′A'A′ or not(A)
P(A)+P(A′)=1P(A) + P(A') = 1P(A)+P(A′)=1
P(A′)=1−P(A)P(A') = 1 - P(A)P(A′)=1−P(A)
A∪A′=SA ∪ A' = SA∪A′=S (covers entire sample space)
Complementary must cover entire sample space
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