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  2. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    The lengths of the periods for various n form the so-called Pisano periods. [65] Determining a general formula for the Pisano periods is an open problem, which includes as a subproblem a special instance of the problem of finding the multiplicative order of a modular integer or of an element in a finite field.

  3. Smoking in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Smoking_in_the_United_Kingdom

    Until 30 September 2007, the minimum age to purchase and consume tobacco products in public was 16 years of age. From 30 September 2007, the Tobacco and Primary Medical Services (Scotland) Act 2010 became effective, raising the minimum purchase, consumption, and possession age to 18 years of age. Section 4: Sale of tobacco products to persons ...

  4. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    By definition of Stirling numbers of the second kind, the probability that exactly T draws are needed is (,)! By manipulating the generating function of the Stirling numbers, we can explicitly calculate all moments of T: ():= (,) = = In general, the k-th moment is ()!

  5. Electrical resistivity and conductivity - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistivity_and...

    A piece of resistive material with electrical contacts on both ends. In an ideal case, cross-section and physical composition of the examined material are uniform across the sample, and the electric field and current density are both parallel and constant everywhere.

  6. Hikvision - Wikipedia

    en.wikipedia.org/wiki/Hikvision

    Hangzhou Hikvision Digital Technology Co., Ltd., often shortened to Hikvision, is a Chinese state-owned manufacturer and supplier of video surveillance equipment for civilian and military purposes, headquartered in Hangzhou, Zhejiang.

  7. History of Poland (1945–1989) - Wikipedia

    en.wikipedia.org/wiki/History_of_Poland_(1945...

    The history of Poland from 1945 to 1989 spans the period of Marxist–Leninist regime in Poland after the end of World War II.These years, while featuring general industrialization, urbanization and many improvements in the standard of living, were marred by early Stalinist repressions, social unrest, political strife and severe economic difficulties.

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