1. It's notorious for clashing with many people's intuitions and being very confusing. Many smart people who are experts in probability theory answer it incorre

1. It's notorious for clashing with many people's intuitions and being very confusing. Many smart people who are experts in probability theory answer it incorrectly at first and then it takes them a while to convince themselves they were wrong. 2. On the other hand, if you read about it and understood it once, it's trivial, and you can give a correct answer confidently while still being very bad at probability in general. So you'd be selecting for knowing a piece of trivia rather than any real knowledge or experience. 3. Interviewers are not flawless mechanisms, they're people. They have biases that are different to control for even when they're aware of them. You want to steer clear of questions which a) make it easy for the interviewer to feel smugly superior to the candidate; b) the answer to which looks very easy and natural once you know it well, and it's difficult to remember how non-intuitive it had been before. This question fails badly on both counts.