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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.
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 ...
Only lines with n = 1 or 3 have no points (red). 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 ...
A balance puzzle or weighing puzzle is a logic puzzle about balancing items—often coins—to determine which holds a different value, by using balance scales a limited number of times. These differ from puzzles that assign weights to items, in that only the relative mass of these items is relevant. For example, in detecting a dissimilar coin ...
The Airman's coin is a challenge coin that is awarded to United States Air Force enlisted Airmen upon completion of Basic Military Training at Lackland AFB, Texas. [1][2] After the award of the coin the individual is no longer referred to as " trainee," but as "Airman," marking the successful completion of the first phase of training in ...
Commemorative Coins Help Raise Money for Various Causes. From time to time, Congress authorizes the U.S. Mint to make a limited production run of special commemorative coins. These coins are still ...
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