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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. Luxottica - Wikipedia

    en.wikipedia.org/wiki/Luxottica

    Luxottica Group S.p.A. is an Italian eyewear conglomerate based in Milan. As a vertically integrated company, Luxottica designs, manufactures, distributes, and retails its eyewear brands all through its own subsidiaries. The company, presently organized as a subsidiary of EssilorLuxottica which formed when the Italian conglomerate merged with ...

  4. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    v. t. e. In the United States, academic grading commonly takes on the form of five, six or seven letter grades. Traditionally, the grades are A+, A, A−, B+, B, B−, C+, C, C−, D+, D, D− and F, with A+ being the highest and F being lowest. In some cases, grades can also be numerical. Numeric-to-letter-grade conversions generally vary from ...

  5. Electromagnetic radiation - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_radiation

    Classically, electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields. In a vacuum, electromagnetic waves travel at the speed of light, commonly denoted c. There, depending on the frequency of oscillation, different wavelengths of electromagnetic spectrum are produced.

  6. Angle of incidence (optics) - Wikipedia

    en.wikipedia.org/wiki/Angle_of_incidence_(optics)

    The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle) to the surface at the point of incidence, called the normal. The ray can be formed by any waves, such as optical, acoustic, microwave, and X-ray. In the figure below, the line representing a ray makes an ...

  7. List of alcohol laws of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_alcohol_laws_of...

    [30] [31] For off-premises consumption, alcohol may be purchased only in a liquor store, taproom, or a brew pub that has an off-premises license. Unless accompanied by a parent or guardian over 21, no person under 21 may enter a liquor store or taproom for any reason, even for the intent of purchasing only tobacco or lottery tickets.

  8. Gamma-ray burst - Wikipedia

    en.wikipedia.org/wiki/Gamma-ray_burst

    These account for about 30% of gamma-ray bursts, but until 2005, no afterglow had been successfully detected from any short event and little was known about their origins. [67] Since then, several dozen short gamma-ray burst afterglows have been detected and localized, several of which are associated with regions of little or no star formation ...

  9. List of countries by population (United Nations) - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    List of countries by population (United Nations) This is a list of countries and other inhabited territories of the world by total population, based on estimates published by the United Nations in the 2024 revision of World Population Prospects. It presents population estimates from 1950 to the present. [2]

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