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If `P(A) = 7/(13)`, `P(B) =9/(13)`and `P(AnnB) =4/(13)`, evaluate`P(A|B)`.

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If `P(A) = 7/(13)`, `P(B) =9/(13)`and `P(AnnB) =4/(13)`, evaluate`P(A|B)`.
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`P(A)= 7/13`
`P(B)= 9/13`
`P(A nn B) = 4/13`
`P(A|B)= (P (A nn B))/(P(B))`
`= (4/13)/(9/13)`
`=4/9`
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