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Probability Basicshard
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If P(A)=0.5P(A) = 0.5P(A)=0.5 and P(A∪B)=0.8P(A \cup B) = 0.8P(A∪B)=0.8, and P(B∣A)=0.4P(B|A) = 0.4P(B∣A)=0.4, what is P(B)P(B)P(B)?