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	Mathematical	Records 1-2 of 2
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	TechInterview (Popularity: ) http://www.techinterview.org/ Answers to technical interview questions, programming problems, and brain teasers.
	Perplexus (Popularity: ) http://perplexus.info/ A forum and collection of brain teasers, logic problems, math problems, paradoxes, science games, probability, riddles, and geometric shapes. The ...