7

Answers
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66
Proofs without words
47
A single paper everyone should read?
17
Guess a number with at most one wrong answer
12
100 Prisoners, 100 Boxes: Proof of Optimality
8
Implementation of the Robinson-Schensted Correspondence
5
Older editions of which books were better than the new ones?
1
Decision problem restricted to inputs that satisfy some necessary condition.