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OpenStudy (anonymous):
If P(A or B) = 0.8, P(A) = 0.1 and P(B) = 0.9, determine P(A and B).
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myininaya (myininaya):
P(A or B)=P(A)+P(B)-P(A and B) P(A and B)=P(A)+P(B)-P(A or B) P(A and B)=0.1+0.9-0.8=.1+.1=.2
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