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Hexaflexagons; 2. Magic with a matrix; 3. Nine problems; 4. Ticktacktoe; 5. Probability paradoxes; 6. Curious topological models; 8. Mathematical card tricks; 11. Nine more problems; 13.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.