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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 ...
On August 20, 2005, after months of negotiations, an impasse declared by the NMB and a 30-day cooling off period, the over 4,750 Northwest aircraft mechanics, janitors, and aircraft cleaners represented by AMFA went on strike against the company. After numerous negotiation sessions, no agreement was reached, and the company began hiring ...
The free-software share-alike licenses written by Richard Stallman in the mid-1980s pioneered a concept known as "copyleft". Ensuing copyleft provisions stated that when modified versions of free software are distributed, they must be distributed under the same terms as the original software.
The Thirty Years' War, [ j] from 1618 to 1648, was one of the most destructive conflicts in European history. Fought primarily in Central Europe, an estimated 4.5 to 8 million soldiers and civilians died from the effects of battle, famine, or disease, while parts of Germany reported population declines of over 50%. [ 19]
Oyster photocards, with an image of the authorised user on the card front, are issued to members of groups eligible for free or discounted travel. The cards are encoded to offer discounted fares and are available for students in full-time education (30% off season tickets), 16+ cards (half the adult-rate for single journeys on the Underground ...
Birds are avian dinosaurs, and in phylogenetic taxonomy their over 11,000 extant species are included in the group Dinosauria. Dinosaurs are a diverse group of reptiles [ note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the ...
The net worth of the world's billionaires increased from less than US$1 trillion in 2000 to over $7 trillion in 2015. The World's Billionaires is an annual ranking of people who are billionaires, i.e., they are considered to have a net worth of US$1 billion or more, by the American business magazine Forbes. The list was first published in March ...
Pareto principle. The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity[ 1][ 2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital ...
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