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  2. Wason selection task - Wikipedia

    en.wikipedia.org/wiki/Wason_selection_task

    Each card has a number on one side and color on the other. Which card or cards must be turned over to test the idea that if a card shows an even number on one face, then its opposite face is blue? The Wason selection task (or four-card problem) is a logic puzzle devised by Peter Cathcart Wason in 1966.

  3. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    After three steps, the middle card (*) is the one in all chosen piles. The Twenty-One Card Trick, also known as the 11th card trick or three column trick, is a simple self-working card trick that uses basic mathematics to reveal the user's selected card. The game uses a selection of 21 cards out of a standard deck. These are shuffled and the ...

  4. List of Martin Gardner Mathematical Games columns - Wikipedia

    en.wikipedia.org/wiki/List_of_Martin_Gardner...

    Free will revisited, with a mind-bending prediction paradox by William Newcomb: 1973 Aug: An astounding self-test of clairvoyance by Dr. Matrix 1973 Sep: Problems on the surface of a sphere offer an entertaining introduction to point sets 1973 Oct "Look-see" diagrams that offer visual proof of complex algebraic formulas: 1973 Nov

  5. Play Pinochle Online for Free - AOL.com

    www.aol.com/games/play/masque-publishing/pinochle

    Pinochle. Aces around, dix or double pinochles. Score points by trick-taking and also by forming combinations of cards into melds. By Masque Publishing

  6. Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

  7. Khan Academy - Wikipedia

    en.wikipedia.org/wiki/Khan_Academy

    Khan Academy is an American non-profit [3] educational organization created in 2006 by Sal Khan. [1] Its goal is to create a set of online tools that help educate students. [4] ...

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