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Recreational mathematics
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=== Mathemagics === [[Magic tricks]] based on mathematical principles can produce self-working but surprising effects. For instance, a [[mathemagician]] might use the [[combinatorics|combinatorial]] properties of a deck of [[Standard 52-card deck|playing cards]] to guess a volunteer's selected card, or [[Hamming codes]] to identify whether a volunteer is lying.<ref>{{Cite book|last=Teixeira|first=Ricardo|title=Mathemagics: A Magical Journey through Advanced Mathematics|publisher=World Scientific|year=2020|isbn=9789811214509|location=USA}}</ref>
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