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These problems were selected for originality, general interest, or because they demonstrate valuable techniques. Also includes detailed solutions. Can you solve the problem of "The Unfair Subway"?. In addition, the problems are graded as to difficulty and many have considerable stature.
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.