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Solution to: Boys and Girls

There are four possibilities for two children, with equal probabilities:

  first child: second child:
1 girl girl
2 girl boy
3 boy girl
4 boy boy

The fourth possibility drops out, because Ronald and Michelle have a daughter (so either the first or the second child is a girl). Therefore, three possibilities remain, of which in one case the other child is also a girl. As a result, the probability is 1/3 (about 33%).

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