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Jellonz

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  1. Jellonz

    One Girl - One Boy

    Old thread, and masses of discussion, but to simplify - There are 4 equally likely combinations of 2 children: Boy/Boy; Girl/Girl; Boy/Girl; Girl/Boy. The odds of the second child being a girl depend upon how the OP is interpreted and the possible combinations (green) each interpretation allows. 1. They have two kids, [only] one of them is a girl. Boy/Boy Girl/Girl Boy/Girl Girl/Boy - Trick question. In the 2 possible combinations the other child must be a boy. Probability 0. 2. They have two kids, [the first] one of them is a girl. Boy/Boy Girl/Girl Boy/Girl Girl/Boy - There are 2 possible combinations where the first child is a girl. In 1 the other child is too. Probability 1/2. 3. They have two kids, [at least] one of them is a girl. Boy/Boy Girl/Girl Boy/Girl Girl/Boy - Without the Boy/Boy combination 3 remain, in 1 of which the other child is a girl. Probability 1/3.
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