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For example, in detecting a dissimilar coin in three weighings ( = ), the maximum number of coins that can be analyzed is = .Note that with weighings and coins, it is not always possible to determine the nature of the last coin (whether it is heavier or lighter than the rest), but only that the other coins are all the same, implying that the last coin is the ...
Coin collecting is the collecting of coins or other forms of minted legal tender. Coins of interest to collectors include beautiful, rare, and historically significant pieces. Collectors may be interested, for example, in complete sets of a particular design or denomination, coins that were in circulation for only a brief time, or coins with ...
These coins began circulating on February 15, 2007. Starting 2012, these coins have been minted only for collectible sets because of a large stockpile. The Susan B. Anthony dollar coin was minted from 1979 to 1981 and 1999. The 1999 minting was in response to Treasury supplies of the dollar becoming depleted and the inability to accelerate the ...
Numismatics is the study or collection of currency, including coins, tokens, paper money, medals, and related objects.. Specialists, known as numismatists, are often characterized as students or collectors of coins, but the discipline also includes the broader study of money and other means of payment used to resolve debts and exchange goods.
In 2004, a "dot cent", as they are sometimes called, sold at auction for $207,000. The one-cent coin was sold again in the Canadiana sale for $400,000, while an example of the ten-cent piece with the dot sold for $184,000. [11] The 25¢ coin, while not as rare as the one-cent and ten-cent pieces, is still a very difficult coin to find.
Collecting World Coins: Standard Catalog of Circulating Coinage: 1901–present, 15th Edition, publication date 2015, Krause Publications, ISBN 978-1-4402-4460-5 Digital copy available separately. Standard Catalog of German Coins: 1501–present, 3rd Edition, publication date 2011, Krause Publications, ISBN 978-1-4402-1402-8