I had a cup of coffee this morning and though of this. 0% as an option (instead of 60%) would make the paradox even deeper: A) 25% B) 50% C) 0% D) 25% If you choose C) 0%, you are choosing a "correct" answer, and since "0%" only appears once, it would be a 25% chance, making both A and D correct again for a 50% chance making B correct... deeper into the abyss we go.