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  2. 105 Riddles for Adults That Are Sure to Stump You - AOL

    www.aol.com/lifestyle/found-most-impossible...

    Q: What do the numbers 11, 69 and 88 all have in common? A: They all read the same way when placed upside down. Q: If 2 is company and 3 is a crowd, what are 4 and 5? A: 9. Q: I add 5 to 9 and get 2.

  3. 101 Tricky Riddles for Adults That Will Stump Them - AOL

    www.aol.com/put-brain-test-80-tricky-155100614.html

    For adults, riddles are a great way to exercise the brain and help keep your mind sharp. Also, if you find yourself in an awkward social situation, sometimes a good riddle can help break the ice.

  4. 78 Riddles for Adults That Will Test Your Smarts - AOL

    www.aol.com/lifestyle/78-riddles-adults-test...

    You'll have to really stretch your brain to figure out some of these easy, funny, and hard riddles for grown-ups! The post 78 Riddles for Adults That Will Test Your Smarts appeared first on Reader ...

  5. Missing dollar riddle - Wikipedia

    en.wikipedia.org/wiki/Missing_dollar_riddle

    Flow of dollars in the riddle – comparing the sum of values circled in yellow (10+10+10=30) with the sum of absolute values of those shaded yellow (9+9+9+2=29) is meaningless. The missing dollar riddle is a famous riddle that involves an informal fallacy. It dates to at least the 1930s, although similar puzzles are much older. [1]

  6. 48 Short Riddles That Will Still Stump You - AOL

    www.aol.com/48-short-riddles-still-stump...

    Try out these quick, bite-size riddles—some are easy, and some are still pretty tricky! The post 48 Short Riddles That Will Still Stump You appeared first on Reader's Digest.

  7. Logic puzzle - Wikipedia

    en.wikipedia.org/wiki/Logic_puzzle

    The logic puzzle was first produced by Charles Lutwidge Dodgson, who is better known under his pen name Lewis Carroll, the author of Alice's Adventures in Wonderland.In his book The Game of Logic he introduced a game to solve problems such as confirming the conclusion "Some greyhounds are not fat" from the statements "No fat creatures run well" and "Some greyhounds run well". [1]

  8. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  9. I Tried the 'Harvard Riddle'—the 'Hardest Riddle in the World ...

    www.aol.com/tried-harvard-riddle-hardest-riddle...

    According to a YouTuber who shared this video with over 23 million views, 98% of Harvard students can't solve this riddle, which is also referred to as the "I Turn Polar Bears White" riddle. I ...