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  2. Card counting - Wikipedia

    en.wikipedia.org/wiki/Card_counting

    Card counting is based on statistical evidence that high cards (aces, 10s, and 9s) benefit the player, while low cards, (2s, 3s, 4s, 5s, 6s, and 7s) benefit the dealer. High cards benefit the player in the following ways: They increase the player's probability of hitting a Blackjack, which often pays out at 3 to 2 odds (although some casinos ...

  3. Change-making problem - Wikipedia

    en.wikipedia.org/wiki/Change-making_problem

    Change-making problem. The change-making problem addresses the question of finding the minimum number of coins (of certain denominations) that add up to a given amount of money. It is a special case of the integer knapsack problem, and has applications wider than just currency. It is also the most common variation of the coin change problem, a ...

  4. Finger-counting - Wikipedia

    en.wikipedia.org/wiki/Finger-counting

    Finger-counting, also known as dactylonomy, is the act of counting using one's fingers. There are multiple different systems used across time and between cultures, though many of these have seen a decline in use because of the spread of Arabic numerals. Finger-counting can serve as a form of manual communication, particularly in marketplace ...

  5. Tally stick - Wikipedia

    en.wikipedia.org/wiki/Tally_stick

    Tally stick. Medieval English split tally stick (front and reverse view). The stick is notched and inscribed to record a debt owed to the rural dean of Preston Candover, Hampshire, of a tithe of 20 d each on 32 sheep, amounting to a total sum of £2 13s. 4d. A tally stick (or simply tally[1]) was an ancient memory aid device used to record and ...

  6. History of money - Wikipedia

    en.wikipedia.org/wiki/History_of_money

    e. The history of money is the development over time of systems for the exchange, storage, and measurement of wealth. Money is a means of fulfilling these functions indirectly and in general rather than directly, as with barter. Money may take a physical form as in coins and notes, or may exist as a written or electronic account.

  7. MIT Blackjack Team - Wikipedia

    en.wikipedia.org/wiki/MIT_Blackjack_Team

    It involved three players: a big player, a controller, and a spotter. The spotter checked when the deck went positive with card counting, the controller would bet small constantly, wasting money, and verifying the spotter's count. Once the controller found a positive, he would signal to the big player. He would make a massive bet, and win big.

  8. Dyscalculia - Wikipedia

    en.wikipedia.org/wiki/Dyscalculia

    Dyscalculia (/ ˌdɪskælˈkjuːliə /) [1][2][3][4] is a learning disability resulting in difficulty learning or comprehending arithmetic, such as difficulty in understanding numbers, learning how to manipulate numbers, performing mathematical calculations, and learning facts in mathematics. It is sometimes colloquially referred to as "math ...

  9. Currency-counting machine - Wikipedia

    en.wikipedia.org/wiki/Currency-counting_machine

    A currency-counting machine is a machine that counts money—either stacks of banknotes or loose collections of coins. Counters may be purely mechanical or use electronic components. The machines typically provide a total count of all money, or count off specific batch sizes for wrapping and storage. Currency counters are commonly used in ...

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