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2. 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 ()!

3. Ray of Light (song) - Wikipedia

   en.wikipedia.org/wiki/Ray_of_Light_(song)

   "Ray of Light" is a song by American singer Madonna. It is the title track from her seventh studio album, Ray of Light (1998), and was released as the album's second single on April 27, 1998, by Maverick Records.

4. Trade promotion (marketing) - Wikipedia

   en.wikipedia.org/wiki/Trade_promotion_(marketing)

   In 2004, less than 30% of Trade Promotions in the Consumer Packaged Goods industry were profitable. [4] Several issues cause such lack of profitability . Some potential problems associated with trade promotions programs are costs, the potential impact on small manufacturers, and the tendency to rely too much on trade promotions to move merchandise.

5. Cathode-ray tube - Wikipedia

   en.wikipedia.org/wiki/Cathode-ray_tube

   A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. [2] The images may represent electrical waveforms on an oscilloscope , a frame of video on an analog television set (TV), digital raster graphics on a computer monitor , or ...

6. Big Bang - Wikipedia

   en.wikipedia.org/wiki/Big_Bang

   The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.

7. List of smoking bans - Wikipedia

   en.wikipedia.org/wiki/List_of_smoking_bans

   On 30 July 2012, Interior Minister Prince Ahmed bin Abdulaziz ordered the implementation of a royal ban on smoking in all government facilities (ministries, buildings, institutions, offices etc.) [221] and most indoor public places. The ban also prohibits smoking of hookahs in public places, and prohibits selling tobacco to anyone under 18.