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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. Coin orientation - Wikipedia

    en.wikipedia.org/wiki/Coin_orientation

    Coin orientation (or coin alignment or variations of these) is the relation of the vertical orientation of the images on the obverse and reverse sides of coins to one another. The two basic relations are called medallic orientation and coin orientation .

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

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

    LoveToKnow described proof coins as “the most beautiful and perfectly minted coins possible,” and refers to this specific Lincoln penny as a “superb proof.” 1970-S Small Date Penny: $18,400

  6. Walking Liberty half dollar - Wikipedia

    en.wikipedia.org/wiki/Walking_Liberty_half_dollar

    Design date. 1916–1947. The Walking Liberty half dollar is a silver 50-cent piece or half dollar coin that was issued by the United States Mint from 1916 to 1947; it was designed by Adolph A. Weinman, a well-known sculptor and engraver. In 1915, the new Mint Director, Robert W. Woolley, came to believe that he was not only allowed but ...

  7. 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.

  8. Lincoln cent - Wikipedia

    en.wikipedia.org/wiki/Lincoln_cent

    The Lincoln cent (sometimes called the Lincoln penny) is a one-cent coin that has been struck by the United States Mint since 1909. The obverse or heads side was designed by Victor David Brenner, as was the original reverse, depicting two stalks of wheat (thus "wheat pennies", struck 1909–1958). The coin has seen several reverse, or tails ...

  9. Checking whether a coin is fair - Wikipedia

    en.wikipedia.org/wiki/Checking_whether_a_coin_is...

    The symbols H and T represent more generalised variables expressing the numbers of heads and tails respectively that might have been observed in the experiment. Thus N = H + T = h + t. Next, let r be the actual probability of obtaining heads in a single toss of the coin. This is the property of the coin which is being investigated.

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