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Solution to: Boys and Girls

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

 First childSecond child
1girlgirl
2girlboy
3boygirl
4boyboy

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 ⅓ (about 33%).


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