So that's what confused me to begin with as well. I think the main thing here depends on your interpretation of how the parent is chosen. Let's say the questi

So that's what confused me to begin with as well. I think the main thing here depends on your interpretation of how the parent is chosen. Let's say the question is the same, but we relax the requirement that the boy is born on Tuesday. Do you think the probability that the other child is a girl is 2/3 or 1/2?