From the designs on Mondrian's paintings to the elegant organization of mathematical sequences, these puzzles all involve the wonderful world of patterns. Some use colors, others feature letters, and still more focus on shapes, but all offer plenty of entertainment. Suppose you have a supply of beads in red, green, and yellow, and are making them into necklaces that consist of five beads each. If each necklace has two beads of one color, two of a second, and one of a third, how many distinct necklaces can you create? Or, for another kind of pattern, try solving anagrams and deciphering cryptograms to unearth secret messages. Fold ten flaps into a five-by-five square to form a pinwheel pattern. Every problem is intriguing.

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ThriftBooks is a fully independent seller of used books, having sold more than 160 million used and new books since we started in 2003. Each quality used book is sorted, graded, shelved and shipped by hand by our team of dedicated employees in our seven warehouses across the US. We have the best selection of books, in the right condition and format, at everyday low prices. We also have a dedicated, US-based Customer Service team, ranked in the top three by Newsweek for Best Customer Service in 2018 and 2019, so you can shop with confidence. We support and invest in our employees, appreciate and value our customers, and truly believe in the power of the written word to educate, energize, and engage readers of all ages and interests.

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We guarantee each book that we send you. If you have any problems, please contact
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