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English Pages 160 [164] Year 2018
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It's true--playing with numbers can raise your I.Q., and help you think more clearly! The most popular numbers game
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This collection of more than one hundred original and highly sophisticated puzzles presents challenges that require crea
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This first truly comprehensive and beautiful volume on one of the world's most popular and intriguing puzzles comes
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You have two ropes that each burn in 1 hour but not at a uniform rate. How can you measure 45 minutes? How can you make
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