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The World's 200 Hardest Brain Teasers: Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain by Gary R. Gruber

The World's 200 Hardest Brain Teasers: Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain

Gary R. Gruber

188 pages • paperback • 2010

nonfiction mathematics informative medium-paced
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