Answer :
ANSWER
P(A|B) = 1
EXPLANATION
By the Bayes rule:
[tex]P(A|B)=\frac{P(A\text{ and B)}}{P(B)}[/tex]In this problem both probabilities are equal: P(A and B) = 4/9 and P(B) = 4/9. The probability of A given B is:
[tex]P(A|B)=\frac{4/9}{4/9}=1[/tex]