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OpenStudy (anonymous):
Sets and probability Suppose n(A upside down U B)=5, n(A U B)=35, and n(A)=12 What is n(B)?
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OpenStudy (watchmath):
\(n(A\cup B)=n(A)+n(B)-n(A\cap B)\) \(35=12+n(B)-5\) \(n(B)=28\).
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