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Definitely a book for High School, this book contains 430 brainteasers based on algebra, arithmetic, permutations, probability, plane figure dissection, properties of numbers, etc. Intriguing, witty, paradoxical productions of one of the world's foremost creators of puzzles. Full solutions. More than 450 illustrations. Download available @ http://www.christianhomeschoolhub.com/download-categories.htm under "Curriculum Treasures from the Past"