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Bertrand's box paradox is a veridical paradox in elementary probability theory. It was first posed by Joseph Bertrand in his 1889 work Calcul des Probabilités . There are three boxes: a box containing two gold coins, a box containing two silver coins, a box containing one gold coin and one silver coin. Choose a box at random.
Reverse. Design. Various depictions of eagles. Designer. Various. Design date. 2015–present. The American Liberty high relief gold coin is a one-ounce gold bullion coin issued by the United States Mint since 2015. [1] This coin was the first 100 dollar gold coin to be issued by the US Mint.
1908. The Indian Head gold pieces or Pratt-Bigelow gold coins were two separate coin series, identical in design, struck by the United States Mint: a two-and-a-half-dollar piece, or quarter eagle, and a five-dollar coin, or half eagle. The quarter eagle was struck from 1908 to 1915 and from 1925–1929. The half eagle was struck from 1908 to ...
The America the Beautiful silver bullion coins comprise a series of silver bullion coins with a face value of a quarter dollar. The coins contain five troy ounces of silver, making them the largest silver bullion coins ever issued by the United States Mint. The design of the coins duplicates exactly—though enlarged—each of the America the ...
From 2013 the gold coins have a millesimal fineness of 0.9999 (or 24 carat gold). Until 2012 the gold coins have a millesimal fineness of 0.917 (91.7% or 22 carat gold) with the non-gold component being copper until 1989 and silver from 1990. 2013– Gold Britannia specifications (gold content, and approx total weight)
The Royal Mint realised there was a market for sovereign coins, and began to sell them to collectors at well over face or bullion value. [41] Beginning in 1980, five-pound gold coins were sold every year, except 1983, sometimes in a four-piece proof set with the half sovereign, sovereign and double sovereign, and sometimes sold individually.
The half eagle is a United States coin that was produced for circulation from 1795 to 1929 and in commemorative and bullion coins since 1983. Composed almost entirely of gold, its face value of five dollars is half that of the eagle coin. Production of the half eagle was authorized by the Coinage Act of 1792, and it was the first gold coin ...
In Western Europe, the solidus was the main gold coin of commerce from late Roman times to Pepin the Short's currency reform in the 750s, which introduced the silver-based pound-shilling-penny system. In Late Antiquity and the Middle Ages, the solidus also functioned as a unit of weight equal to 1 ⁄ 72 Roman pound (approximately 4.5 grams).