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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 than t boxes need to be bought ...
1980–2006; 26 years (Australia) S VHS Recorder, Camcorder & Cassette. The VHS ( Video Home System) [1] [2] [3] is a standard for consumer-level analog video recording on tape cassettes, invented in 1976 by the Victor Company of Japan (JVC). It was the dominant home video format throughout the tape media period in the 1980s, 1990s, and early ...
Intensive animal farming is a relatively recent development in the history of agriculture, utilizing scientific discoveries and technological advances to enable changes in agricultural methods that increase production. Innovations from the late 19th century generally parallel developments in mass production in other industries in the latter ...
In order to buy from abroad without credit or foreign exchange (cash), a nation needed goods or gold to offer, but the British export ban prevented her from raising revenue. In World War I, even after two years of war Germany still had gold reserves worth 2.5m marks and over 30 billion marks invested abroad, giving her easy access to exports. [35]
ExxonMobil, an American multinational oil and gas corporation presently based out of Texas, has had one of the longest histories of any company in its industry.A direct descendant of John D. Rockefeller's Standard Oil, the company traces its roots as far back as 1886 to the founding of the Vacuum Oil Company, which would become part of ExxonMobil through its own merger with Mobil during the 1930s.
Free-electron lasers The free-electron laser FELIX at the FOM Institute for Plasma Physics Rijnhuizen, Nieuwegein. Free-electron lasers (FEL) generate coherent, high-power radiation that is widely tunable, currently ranging in wavelength from microwaves through terahertz radiation and infrared to the visible spectrum, to soft X-rays. They have ...