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OpenStudy (anonymous):
If A and B are events, P(A)= .3, P(A or B)= .7, and P(A and B)= .05, what is P(B)?
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OpenStudy (nikvist):
\[P(A\cup B)=P(A)+P(B)-P(A\cap B)\] \[P(B)=P(A\cup B)+P(A\cap B)-P(A)=0.7+0.05-0.3=0.45\]
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