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  2. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/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 than t boxes need to be bought ...

  3. Rationing - Wikipedia

    en.wikipedia.org/wiki/Rationing

    Rationing is the controlled distribution of scarce resources, goods, services, [ 1] or an artificial restriction of demand. Rationing controls the size of the ration, which is one's allowed portion of the resources being distributed on a particular day or at a particular time. There are many forms of rationing, although rationing by price is ...

  4. Rationing in the United States - Wikipedia

    en.wikipedia.org/wiki/Rationing_in_the_United_States

    An "A" sticker on a car was the lowest priority of gasoline rationing and entitled the car owner to 3 to 4 US gallons (11 to 15 L; 2.5 to 3.3 imp gal) of gasoline per week. "B" stickers were issued to workers in the military industry, entitling their holder to up to 8 US gallons (30 L; 6.7 imp gal) of gasoline per week.

  5. Rationing in Cuba - Wikipedia

    en.wikipedia.org/wiki/Rationing_in_Cuba

    As of 2012, a coupon book taken to a ration shop provided family minimums for rice, sugar, matches, and oil, above the average wage of $30/month. [3] While most Cubans do not have to pay for rent, healthcare, or education, ration fees often take up a large percentage of their monthly income, and the unsubsidized costs of their monthly rations ...

  6. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    Buy one, get one free. " Buy one, get one free " or " two for the price of one " is a common form of sales promotion. Economist Alex Tabarrok has argued that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion ...

  7. Harmonic series (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_series_(mathematics)

    In mathematics, the harmonic series is the infinite series formed by summing all positive unit fractions: = = + + + + +.. The first terms of the series sum to approximately ⁡ +, where is the natural logarithm and is the Euler–Mascheroni constant.

  8. List of Google products - Wikipedia

    en.wikipedia.org/wiki/List_of_Google_products

    Google Pixel – smartphones, tablets, laptops, earbuds, and other accessories. Google Nest – smart home products including smart speakers, smart displays, digital media players, smart doorbells, smart thermostats, smoke detectors, and wireless routers. Google Chromecast – digital media players.

  9. Aldi - Wikipedia

    en.wikipedia.org/wiki/Aldi

    Aldi stores are noted as examples of so-called no-frills stores that often display a variety of items at discount prices, specializing in staple items, such as food, beverages, toilet paper, sanitary articles, and other inexpensive household items. Many of its products are own brands, with the number of other brands usually limited to a maximum ...

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