2 puzzles from George Boolos, each explained in a minute and credited to the original work. Free on Savvy.
Three gods, A, B and C, are called (in some order) True, False and Random — True always answers truthfully, False always answers falsely, and Random answers truthfully or falsely a…
— George Boolos, The Hardest Logic Puzzle Ever
Three gods, A, B, and C, are called True, False, and Random, in some order. True always answers truthfully, False always lies, and Random answers truthfully or falsely by pure chan…
— George Boolos, The Hardest Logic Puzzle Ever