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find p(a|b) and find p(b|a) if p(a)=.5 p(b)=.6 and p(a ∩ b)=.4 how do I know...

find p(a|b) and find p(b|a) if p(a)=.5 p(b)=.6 and p(a ∩ b)=.4

how do I know if A and B are independent?

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