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  2. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    Four fours is a mathematical puzzle, the goal of which is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four. No other digit is allowed.

  3. Four glasses puzzle - Wikipedia

    en.wikipedia.org/wiki/Four_glasses_puzzle

    Four glasses or tumblers are placed on the corners of a square Lazy Susan.Some of the glasses are upright (up) and some upside-down (down). A blindfolded person is seated next to the Lazy Susan and is required to re-arrange the glasses so that they are all up or all down, either arrangement being acceptable, which will be signalled by the ringing of a bell.

  4. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    In graph-theoretic terms, the theorem states that for a loopless planar graph, its chromatic number is ().. The intuitive statement of the four color theorem – "given any separation of a plane into contiguous regions, the regions can be colored using at most four colors so that no two adjacent regions have the same color" – needs to be interpreted appropriately to be correct.

  5. Can You Solve the Puzzle of Four Knights?

    www.aol.com/lifestyle/solve-puzzle-four-knights...

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  6. Mathematical puzzle - Wikipedia

    en.wikipedia.org/wiki/Mathematical_puzzle

    They have specific rules, but they do not usually involve competition between two or more players. Instead, to solve such a puzzle, the solver must find a solution that satisfies the given conditions. Mathematical puzzles require mathematics to solve them. Logic puzzles are a common type of mathematical puzzle.

  7. Play Solitaire Four Seasons Online for Free - AOL.com

    www.aol.com/.../solitaire-four-seasons

    Arrange the cards in ascending order, by suit into four foundations. The cards of the starting rank must be played the first. Play Solitaire Four Seasons Online for Free - AOL.com

  8. Sum of four cubes problem - Wikipedia

    en.wikipedia.org/wiki/Sum_of_four_cubes_problem

    The sum of four cubes problem [1] asks whether every integer is the sum of four cubes of integers. It is conjectured the answer is affirmative, but this conjecture has been neither proven nor disproven. [2] Some of the cubes may be negative numbers, in contrast to Waring's problem on sums of cubes, where they are required to be positive.

  9. Can't do a pushup? These 4 exercises will help you get there

    www.aol.com/news/cant-pushup-4-exercises-help...

    Start by getting down on all fours with your palms on the mat a little wider than shoulder-width apart. Make sure your arms are straight. Reach your legs straight behind you, tucking the toes ...