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  2. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...

  3. United States fifty-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_fifty-dollar...

    The United States fifty-dollar bill (US$50) is a denomination of United States currency. The 18th U.S. president (1869-1877), Ulysses S. Grant, is featured on the obverse, while the U.S. Capitol is featured on the reverse. All current-issue $50 bills are Federal Reserve Notes . As of December 2018, the average life of a $50 bill in circulation ...

  4. Larry Ellison - Wikipedia

    en.wikipedia.org/wiki/Larry_Ellison

    [50] [51] Ellison left the Tesla Board in August 2022. [52] As of June 2020, Ellison is said to be the seventh wealthiest person in the world, with a net worth of $66.8 billion. [53] As of 2022, Ellison owns 42.9 percent of the shares of Oracle Corporation, [54] and as of June 2023, 1.4 percent of the shares of Tesla. [55]

  5. Zener cards - Wikipedia

    en.wikipedia.org/wiki/Zener_cards

    Paranormal. Zener cards are cards used to conduct experiments for extrasensory perception (ESP). Perceptual psychologist Karl Zener (1903–1964) designed the cards in the early 1930s for experiments conducted with his colleague, parapsychologist J. B. Rhine (1895–1980). [1] [2]

  6. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.

  7. Display resolution standards - Wikipedia

    en.wikipedia.org/wiki/Display_resolution_standards

    A display resolution standard is a commonly used width and height dimension (display resolution) of an electronic visual display device, measured in pixels. This information is used for electronic devices such as a computer monitor. Certain combinations of width and height are standardized (e.g. by VESA [1] [2]) and typically given a name and ...

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