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Check whether the following probabilites...

Check whether the following probabilites P(A) and P(B) are consistently defined.
`P(A)=0.5,P(B)=0.4,P(AcupB)=0.8`

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ii) .P(A nn B)=0.5+0.4-0.8=0.9-0.8=0.1 .. So for the given values, probabilities are consistent.
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