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  2. Sum and Product Puzzle - Wikipedia

    en.wikipedia.org/wiki/Sum_and_Product_Puzzle

    The Sum and Product Puzzle, also known as the Impossible Puzzle because it seems to lack sufficient information for a solution, is a logic puzzle. It was first published in 1969 by Hans Freudenthal, [1] [2] and the name Impossible Puzzle was coined by Martin Gardner. [3] The puzzle is solvable, though not easily. There exist many similar puzzles.

  3. 120 Fascinating Unanswerable Questions That Will ... - AOL

    www.aol.com/120-fascinating-unanswerable...

    Unanswerable questions may not have solutions, but they sure give our minds one heck of a workout. That's what makes them equally fun and frustrating to ponder. Trying to come up with joke answers ...

  4. The Hardest Logic Puzzle Ever - Wikipedia

    en.wikipedia.org/wiki/The_Hardest_Logic_Puzzle_Ever

    Boolos provides the following clarifications: [1] a single god may be asked more than one question, questions are permitted to depend on the answers to earlier questions, and the nature of Random's response should be thought of as depending on the flip of a fair coin hidden in his brain: if the coin comes down heads, he speaks truly; if tails ...

  5. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    It is impossible to solve in half of the starting positions. [1] Five room puzzle – Cross each wall of a diagram exactly once with a continuous line. [2] MU puzzle – Transform the string MI to MU according to a set of rules. [3] Mutilated chessboard problem – Place 31 dominoes of size 2×1 on a chessboard with two opposite corners removed ...

  6. A College Student Just Solved a Notoriously Impossible Math ...

    www.aol.com/college-student-just-solved...

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  7. The Impossible Quiz - Wikipedia

    en.wikipedia.org/wiki/The_Impossible_Quiz

    In the mobile versions, a feature called a "Moron Mark" appears every 20 questions which allows players to reset from a particular question if all lives are lost. [2] The quiz was also noted for its irreverent humor. [1] [6] Some questions contained references to video games and popular culture, [3] [7] while other questions consisted of ...

  8. Undecidable problem - Wikipedia

    en.wikipedia.org/wiki/Undecidable_problem

    A decision problem is a question which, for every input in some infinite set of inputs, requires a "yes" or "no" answer. [2] Those inputs can be numbers (for example, the decision problem "is the input a prime number?") or values of some other kind, such as strings of a formal language.

  9. Category:Unsolvable puzzles - Wikipedia

    en.wikipedia.org/wiki/Category:Unsolvable_puzzles

    The following 13 pages are in this category, out of 13 total. ... List of impossible puzzles; 0–9. 14-15 puzzle; A. Angle trisection ... Text is available under the ...