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12 cards from this deck
Events that cannot occur at the same time
No outcomes in common
P(A or B)=P(A)+P(B)P(A \text{ or } B) = P(A) + P(B)P(A or B)=P(A)+P(B)
OR rule
P(A or B)=P(A)+P(B)−P(A and B)P(A \text{ or } B) = P(A) + P(B) - P(A \text{ and } B)P(A or B)=P(A)+P(B)−P(A and B)
To avoid counting outcomes twice (double counting)
Can events happen simultaneously? If no, they're mut. excl.
Probability of at least one event happening
Yes - cannot show both 5 and 3 at same time
No - 6 is both even and greater than 4
No - 2 is both prime and even
Double counting outcomes that belong to both events
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