TED-Ed: Can you solve the prisoner hat riddle? - Alex Gendler

In a test by aliens, humans must guess the color of their hats to prove their logic. The game involves standing in a line and guessing based on the parity of visible hats. A strategy is devised where the first person communicates parity information, allowing others to deduce their hat color. This method ensures at least nine correct guesses, saving the group. The video explains the rules, strategy, and provides an example, demonstrating the effectiveness of the approach.

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