It's Not As Simple As You Think It Is

Probability Level 2

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 AB \frac { A }{ B } where A A and B B are Coprime integers. Evaluate A+B A + B .

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