In a country in which people only want boys every family continues to have children until they have a boy. If they have a girl, they have another child. If they have a boy, they stop. What is the proportion of boys to girls in the country?
The "official" answer is 50-50, although you may be inclined to think that such a country would overproduce girls.
Spoiler: Here's a link to a great answer and discussion. Try not to peek at it before you give it a shot.
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