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OpenStudy (anonymous):
Events A and B are disjointed. P(A) = 1/10 P(B) =3/10 Find P(A or B).
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OpenStudy (anonymous):
If they are disjoint events, then the probability of "or" means that you add the two probabilities together. P(a or b) = Prob A + Prob B - Prob (A and B). Since the Prob (A and B) = 0 (since they are disjoint meaning that they can't happen together), the probabilities just add.
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