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Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.

9 votes
1 answer
3k views

Generalization of Finch Cheney's 5 Card Trick

The Original Fitch Cheney puzzle goes like this: A Volunteer from the crowd chooses any five cards at random from a deck, and hands them to you so that nobody else can see them. …
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