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  2. Hashiwokakero - Wikipedia

    en.wikipedia.org/wiki/Hashiwokakero

    Hashiwokakero (橋をかけろ Hashi o kakero; lit. "build bridges!") is a type of logic puzzle published by Nikoli. [1] It has also been published in English under the name Bridges or Chopsticks (based on a mistranslation: the hashi of the title, 橋, means bridge; hashi written with another character, 箸, means chopsticks).

  3. Mathematical Kangaroo - Wikipedia

    en.wikipedia.org/wiki/Mathematical_Kangaroo

    Since then, the competition has spread around the world. Pupils from Sweden first took part in 1999. [5] By 2011, 860,000 pupils from 9,000 schools took part in Germany, having grown rapidly from 549,000 in 2007. [6] In 2014, the competition was hosted in Latin America. [7] In 2017, the Bulgarian association held a week-long Kangaroo summer ...

  4. Contract bridge probabilities - Wikipedia

    en.wikipedia.org/wiki/Contract_bridge_probabilities

    Let ′ (,,,) be the probability of an East player with unknown cards holding cards in a given suit and a West player with unknown cards holding cards in the given suit. The total number of arrangements of (+) cards in the suit in (+) spaces is = (+)!

  5. Bridge number - Wikipedia

    en.wikipedia.org/wiki/Bridge_number

    In bridge representation, a knot lies entirely in the plane apart for a finite number of bridges whose projections onto the plane are straight lines. Equivalently, the bridge number is the minimal number of local maxima of the projection of the knot onto a vector, where we minimize over all projections and over all conformations of the knot.

  6. Sixth grade - Wikipedia

    en.wikipedia.org/wiki/Sixth_grade

    Sixth grade (also 6th grade or grade 6) is the sixth year of formal or compulsory education. Students in sixth grade are usually 12-13 years old. Students in sixth grade are usually 12-13 years old. It is commonly the first or second grade of middle school or the last grade of elementary school, and the sixth school year since kindergarten .

  7. Seven Bridges of Königsberg - Wikipedia

    en.wikipedia.org/wiki/Seven_Bridges_of_Königsberg

    However, all four of the land masses in the original problem are touched by an odd number of bridges (one is touched by 5 bridges, and each of the other three is touched by 3). Since, at most, two land masses can serve as the endpoints of a walk, the proposition of a walk traversing each bridge once leads to a contradiction.