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  2. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    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 ...

  3. Rationing in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Rationing_in_the_United...

    All types of soap were rationed. Coupons were allotted by weight or (if liquid) by quantity. In 1945, the ration gave four coupons each month; babies and some workers and invalids were allowed more. [49] A coupon would yield: 4 oz (113 g) bar hard soap; 3 oz (85 g) bar toilet soap; 1 ⁄ 2 oz (14 g) No. 1 liquid soap; 6 oz (170 g) soft soap

  4. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    The 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, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.

  5. Abortion law in the United States by state - Wikipedia

    en.wikipedia.org/wiki/Abortion_law_in_the_United...

    Wade on June 24, 2022, North Dakota moved to ban "almost all abortions, except in the case of rape, incest, or where the mother's life is at risk". [27] The ban was temporarily blocked by a court. [144] Performing an abortion under the proposed ban is a Class C felony, [109] punishable by up to five years in prison and up to a $10,000 fine. [145]

  6. Nuclear weapon design - Wikipedia

    en.wikipedia.org/wiki/Nuclear_weapon_design

    Nuclear fission separates or splits heavier atoms to form lighter atoms. Nuclear fusion combines lighter atoms to form heavier atoms. Both reactions generate roughly a million times more energy than comparable chemical reactions, making nuclear bombs a million times more powerful than non-nuclear bombs, which a French patent claimed in May 1939.

  7. List of abbreviations used in medical prescriptions - Wikipedia

    en.wikipedia.org/wiki/List_of_abbreviations_used...

    Latin, "at one's pleasure"; as much as one desires; freely compare pro re nata, "as needed", which by convention includes an aspect of "up to some maximum". Similarly, compare s.o.s., q.l., and q.s. admov. admove admoveatur: apply [or] add add; let there be added ad us. ad usum: according to custom æq. æquales: equal agit. agita

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