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  2. Challenge coin - Wikipedia

    en.wikipedia.org/wiki/Challenge_coin

    A challenge coin is a small coin or medallion, bearing an organization's insignia or emblem and carried by the organization's members. Traditionally, they might be given to prove membership when asked and to enhance morale. They are also collected by service members and law enforcement personnel.

  3. Gettier problem - Wikipedia

    en.wikipedia.org/wiki/Gettier_problem

    Gettier problem. The Gettier problem, in the field of epistemology, is a landmark philosophical problem concerning the understanding of descriptive knowledge. Attributed to American philosopher Edmund Gettier, Gettier-type counterexamples (called "Gettier-cases") challenge the long-held justified true belief (JTB) account of knowledge.

  4. Coin problem - Wikipedia

    en.wikipedia.org/wiki/Coin_problem

    In mathematics, the coin problem (also referred to as the Frobenius coin problem or Frobenius problem, after the mathematician Ferdinand Frobenius) is a mathematical problem that asks for the largest monetary amount that cannot be obtained using only coins of specified denominations. [1] For example, the largest amount that cannot be obtained ...

  5. Obama caught in photos handing servicemen challenge coins ...

    www.aol.com/article/2014/05/21/obama-caught-in...

    A challenge coin, tucked in the palm of the United States president, is passed to a member of the military in a seemingly ordinary handshake. For photojournalists who cover the president ...

  6. Examples of Markov chains - Wikipedia

    en.wikipedia.org/wiki/Examples_of_Markov_chains

    A game of snakes and ladders or any other game whose moves are determined entirely by dice is a Markov chain, indeed, an absorbing Markov chain. This is in contrast to card games such as blackjack, where the cards represent a 'memory' of the past moves. To see the difference, consider the probability for a certain event in the game.

  7. Change-making problem - Wikipedia

    en.wikipedia.org/wiki/Change-making_problem

    Change-making problem. The change-making problem addresses the question of finding the minimum number of coins (of certain denominations) that add up to a given amount of money. It is a special case of the integer knapsack problem, and has applications wider than just currency. It is also the most common variation of the coin change problem, a ...

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