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2. Indian Head gold pieces - Wikipedia

   en.wikipedia.org/wiki/Indian_Head_gold_pieces

   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 ...

3. Gold dollar - Wikipedia

   en.wikipedia.org/wiki/Gold_dollar

   The gold dollar or gold one-dollar piece is a gold coin that was struck as a regular issue by the United States Bureau of the Mint from 1849 to 1889. The coin had three types over its lifetime, all designed by Mint Chief Engraver James B. Longacre. The Type 1 issue has the smallest diameter (0.5 inch =12.7mm) of any United States coin minted to ...

4. Double eagle - Wikipedia

   en.wikipedia.org/wiki/Double_eagle

   A double eagle is a gold coin of the United States with a denomination of $20. [1] (Its gold content of 0.9675 troy ounces [30.09 g] was worth $20 at the 1849 official price of $20.67/ozt.) The coins are 34 mm × 2 mm and are made from a 90% gold (0.900 fine or 21.6 kt) and 10% copper alloy and have a total weight of 1.0750 troy ounces (1.1794 ...

5. Bertrand's box paradox - Wikipedia

   en.wikipedia.org/wiki/Bertrand's_box_paradox

   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.

6. Wheat and chessboard problem - Wikipedia

   en.wikipedia.org/wiki/Wheat_and_chessboard_problem

   The problem may be solved using simple addition. With 64 squares on a chessboard, if the number of grains doubles on successive squares, then the sum of grains on all 64 squares is: 1 + 2 + 4 + 8 + ... and so forth for the 64 squares. The total number of grains can be shown to be 2 64 −1 or 18,446,744,073,709,551,615 (eighteen quintillion ...

7. These 11 Rare Coins Sold for Over $1 Million

   www.aol.com/11-rare-coins-sold-over-130146321.html

   1933 Double Eagle $20 (Regular Strike) Note: All information is up to date as of Nov. 9, 2023. More From GOBankingRates. This article originally appeared on GOBankingRates.com: These 11 Rare Coins ...

8. America the Beautiful silver bullion coins - Wikipedia

   en.wikipedia.org/wiki/America_the_Beautiful...

   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 ...

9. Check out This $1.5 Million Half Dollar Coin and Others Worth ...

   www.aol.com/finance/check-1-5-million-half...

   Before you spend your coins, look out for some of these valuable half-dollars worth up to $1.5 million. See: Check Your $2 Bills — They Could Be Worth Upwards of $4,500