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If `A\ a n d\ B` are two events associated with a random experiment such that `P(AuuB)=0. 8 ,\ P(AnnB)=0. 3\ a n d\ P( A )=0. 5` , find `P(B)`

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`P(A or B) = P(A) + P(B) - P(A and B)`
`0.8=0.5+P(A)-0.3`
`P(A)=0.6`
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