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The counterintuitive solution to this month’s puzzle raises philosophical questions about randomness and information.
Quanta’s new puzzle column asks you to believe the seemingly impossible — that you can win at a number guessing game with absolutely no information.
Solve this variation of Thomas Kirkman’s famous 1850 puzzle by arranging girls in walking groups. And think fast — the clock is ticking.
A 150-year-old conundrum about how to group people has been solved, but many puzzles remain.
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