Somewhat related is the "boy or girl paradox" ( https://en.m.wikipedia.org/wiki/Boy_or_girl_paradox ), where the answer to "Mr. Smith has two children. At least one of them is a boy. What is the probability that both children are boys?” may be 2/3 instead of 1/2. The problem is much debated.

I was made aware of this paradox by the book Bernoulli's Fallacy by Aubrey Clayton ( https://www.goodreads.com/book/show/55825328-bernoulli-s-fal... ), which I do recommend as an interesting read.