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  2. Coin flipping - Wikipedia

    en.wikipedia.org/wiki/Coin_flipping

    Coin flipping, coin tossing, or heads or tails is the practice of throwing a coin in the air and checking which side is showing when it lands, in order to randomly choose between two alternatives. It is a form of sortition which inherently has two possible outcomes. The party who calls the side that is facing up when the coin lands wins.

  3. Obverse and reverse - Wikipedia

    en.wikipedia.org/wiki/Obverse_and_reverse

    The obverse and reverse are the two flat faces of coins and some other two-sided objects, including paper money, flags, seals, medals, drawings, old master prints and other works of art, and printed fabrics. In this usage, obverse means the front face of the object and reverse means the back face. The obverse of a coin is commonly called heads ...

  4. Penney's game - Wikipedia

    en.wikipedia.org/wiki/Penney's_game

    Penney's game. Penney's game, named after its inventor Walter Penney, is a binary (head/tail) sequence generating game between two players. Player A selects a sequence of heads and tails (of length 3 or larger), and shows this sequence to player B. Player B then selects another sequence of heads and tails of the same length.

  5. 6 Coins From the 1970s That Are Worth a Lot of Money - AOL

    www.aol.com/6-coins-1970s-worth-lot-154319500.html

    1970-S Small Date Penny: $18,400. According to Dave’s Collectible Coins blog, this rare 1970-S small-date penny is characterized by “a more delicate date of a finer punch as compared to the ...

  6. Heritage Auctions - Wikipedia

    en.wikipedia.org/wiki/Heritage_Auctions

    Website. ha.com. Heritage Auctions is an American multi-national auction house based in Dallas, Texas. Founded in 1976, Heritage is an auctioneer of numismatic collections, comics, fine art, books, luxury accessories, real estate, and memorabilia from film, music, history, and sports.

  7. Matching pennies - Wikipedia

    en.wikipedia.org/wiki/Matching_pennies

    Tails. −1, +1. +1, −1. Matching pennies. Matching pennies is a non-cooperative game studied in game theory. It is played between two players, Even and Odd. Each player has a penny and must secretly turn the penny to heads or tails. The players then reveal their choices simultaneously. If the pennies match (both heads or both tails), then ...

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