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  2. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    An alternative statement is: given n coupons, how many coupons do you expect you need to draw with replacement before having drawn each coupon at least once? The mathematical analysis of the problem reveals that the expected number of trials needed grows as Θ ( n log ⁡ ( n ) ) {\displaystyle \Theta (n\log(n))} .

  3. Phase-out of incandescent light bulbs - Wikipedia

    en.wikipedia.org/wiki/Phase-out_of_incandescent...

    According to this source, 1 November 2011 to 30 September 2012 will be a transitional period and as of 1 October 2012, imports and sales of ordinary incandescent bulbs of 100 watts or more will be prohibited. The first phase will be followed by a ban on 60-watt-and-higher incandescent light bulbs starting in October 2014.

  4. Hikvision - Wikipedia

    en.wikipedia.org/wiki/Hikvision

    In 2022, Hikvision was awarded a Chinese government contract to develop software to track "key people" in order to prevent them from entering Beijing. [ 16 ] [ 17 ] The same year, IPVM also reported that Hikvision has specific alarms in its software to alert Chinese police to "religion, Falun Gong , and various protest activities. [ 18 ]

  5. Spider-Man 3 - Wikipedia

    en.wikipedia.org/wiki/Spider-Man_3

    Spider-Man 3 is a 2007 American superhero film based on the Marvel Comics character Spider-Man.Produced by Columbia Pictures, Marvel Entertainment, and Laura Ziskin Productions, and distributed by Sony Pictures Releasing, it was directed by Sam Raimi from a screenplay he co-wrote with his brother Ivan and Alvin Sargent.

  6. Cathode-ray tube - Wikipedia

    en.wikipedia.org/wiki/Cathode-ray_tube

    [144] [202] The button may consist of a set of 3 nested cups, with the outermost cup being made of a Nickel–Chromium–Iron alloy containing 40–49% of Nickel and 3–6% of Chromium to make the button easy to fuse to the funnel glass, with a first inner cup made of thick inexpensive iron to shield against x-rays, and with the second ...

  7. 30 (number) - Wikipedia

    en.wikipedia.org/wiki/30_(number)

    30 is a square pyramidal number. 30 is an even, composite, pronic number.With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form , where r is a prime greater than 3.

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