Geert Stappers, le mer. 16 juil. 2025 22:40:37 +0200, a ecrit: > Oh, almost over: Cheryl's Birthday > ( https://en.wikipedia.org/wiki/Cheryl's_Birthday ) > > > Text for that wiki page: > > Albert: I don't know when Cheryl's birthday is, but I know that Bernard > doesn't know too. > Bernard: At first I don't know when Cheryl's birthday is, but I know now. > Albert: Then I also know when Cheryl's birthday is. > > > > My question: Have you examples > where expressing "I don't know" was part of the solution?
We have a joke for our first-year university students: 4 computer scientists enter a bar. The barman asks "Everybody takes a beer, as usual?" The first scientist says "I don't know". The second scientist says "I don't know". The third says "I don't know". The fourth says "So, yes indeed!". Samuel
