This had me thinking about that interview question: "In a country in which people only want boys every family continues to have children until they have a boy.

This had me thinking about that interview question: "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?" Replace girl with "failed startup" and boy with "successful startup" and the answer must be the same... the overall success rate of all startups must be 50%, assuming that people always try for a successful one after they fail. Of course, that means there will be those who succeed on their first try and you might be the one that experiences twenty failures in a row...