Some people have strong opinions about this question: In a family with two children, if at least one of the children is a girl born on Tuesday, what are the chances that both children are girls? In this article, I hope to offer
- A solution to one interpretation of this question,
- An explanation of why the solution seems so counterintuitive,
- A discussion of other interpretations, and
- An implication of this problem for teaching and learning probability. Let’s get started. One...