It's Not As Simple As You Think It Is

There is an equally likely chance of having a boy or girl as a child when having one child. The Johnsons have two children, one of which is a boy. The probability that the other is a girl can be represented by the expression \( \frac { A }{ B } \) where \( A \) and \( B \) are Coprime integers. Evaluate \( A + B \).

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