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10 cards from this deck
It shows the probability that event A occurs.
Use P(A or B) = P(A) + P(B) - P(A and B).
P(A or B) = 0.4 + 0.5 - 0.2 = 0.7.
P(cats or dogs) = (10 + 15 - 5)/30 = 20/30 = 2/3.
It shows elements common to both events.
To avoid double-counting the overlap of A and B.
P(car or bike) = 0.4 + 0.3 - 0.1 = 0.6.
Forgetting to subtract the intersection P(A and B).
They visually organize events and their relationships.
P(tea or coffee) = (40 + 50 - 20)/100 = 70/100 = 0.7.
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