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  2. Wason selection task - Wikipedia

    en.wikipedia.org/wiki/Wason_selection_task

    The Wason selection task (or four-card problem) is a logic puzzle devised by Peter Cathcart Wason in 1966. [ 1][ 2][ 3] It is one of the most famous tasks in the study of deductive reasoning. [ 4] An example of the puzzle is: You are shown a set of four cards placed on a table, each of which has a number on one side and a color on the other.

  3. Face card - Wikipedia

    en.wikipedia.org/wiki/Face_card

    Face card. In a deck of playing cards, the term face card (US) or court card (British and US), [ 1] and sometimes royalty, is generally used to describe a card that depicts a person as opposed to the pip cards. In a standard 52-card pack of the English pattern, these cards are the King, Queen and Jack. The term picture card is also common, but ...

  4. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    Snellen chart. Purpose. Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula ...

  5. Standard 52-card deck - Wikipedia

    en.wikipedia.org/wiki/Standard_52-card_deck

    A standard 52-card French-suited deck comprises 13 ranks in each of the four suits: clubs (♣), diamonds (♦), hearts (♥) and spades (♠). Each suit includes three court cards (face cards), King, Queen and Jack, with reversible (i.e. double headed) images. Each suit also includes ten numeral cards or pip cards, from one (Ace) to ten.

  6. 2nd Battalion, 7th Marines - Wikipedia

    en.wikipedia.org/wiki/2nd_Battalion,_7th_Marines

    The 2nd Battalion, 7th Marines (2/7) is a light infantry battalion of the United States Marine Corps. They are based at the Marine Corps Air Ground Combat Center Twentynine Palms and consist of approximately 800 marines and sailors. The battalion falls under the command of the 7th Marine Regiment and the 1st Marine Division.

  7. Contract bridge probabilities - Wikipedia

    en.wikipedia.org/wiki/Contract_bridge_probabilities

    Suppose East is known to have 7 spades from the bidding and after seeing dummy you deduce West to hold 2 spades; then if your two lines of play are to hope either for diamonds 5-3 or clubs 4-2, the a priori probabilities are 47% and 48% respectively but and so now the club line is significantly better than the diamond line.

  8. One half - Wikipedia

    en.wikipedia.org/wiki/One_half

    One half is a rational number that lies midway between nil and unity (which are the elementary additive and multiplicative identities) as the quotient of the first two non-zero integers, . It has two different decimal representations in base ten, the familiar and the recurring , with a similar pair of expansions in any even base; while in odd ...

  9. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    A unit fraction is a common fraction with a numerator of 1 (e.g., ⁠ 1 / 7 ⁠). Unit fractions can also be expressed using negative exponents, as in 2 −1, which represents 1/2, and 22, which represents 1/(2 2) or 1/4. A dyadic fraction is a common fraction in which the denominator is a power of two, e.g. ⁠ 1 / 8 ⁠ = ⁠ 1 / 2 3 ⁠.

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