Conditional probability for two events A and B given that B has already occured is expressed as
P(AIB) = P(An B)/P(B)
Given that
P(An B) = 4/9 and P(B) = 1/3, it means that
P(AIB) = 4/9 / 1/3
P(AIB) = 4/9 * 3/1 = 4/3
P(AIB) = 4/3
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