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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 ...
Voluntary childlessness. Voluntary childlessness or childfreeness [1] [2] describes the active choice not to have children. The word childfree first appeared sometime before 1901 [3] and entered common usage among feminists during the 1970s. [4] [5] The suffix - free refers to the freedom and personal choice of those to pick this lifestyle.
Yandex LLC (Russian: Яндекс, romanized: Yandeks, IPA:) is a Russian multinational technology company providing Internet-related products and services, including an Internet search engine called Yandex Search, launched in 1997, information services, e-commerce, transportation, maps and navigation, mobile applications, and online advertising.
Off-plan property. Off-plan property is a property before a structure has been constructed upon it. Pre-constructions are usually marketed to real estate developers and to early adopters as developments so that the purchaser can secure more favorable finance terms from their lenders. Property investors or property speculators purchase off-plan ...
Why is the Sun's corona so much hotter than the Sun's surface? (more unsolved problems in astronomy) The temperature of the photosphere is approximately 6,000 K, whereas the temperature of the corona reaches 1,000,000–2,000,000 K. The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy ...
History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...
Tanzania, [c] officially the United Republic of Tanzania, [d] is a country in East Africa within the African Great Lakes region. It is bordered by Uganda to the northwest; Kenya to the northeast; the Indian Ocean to the east; Mozambique and Malawi to the south; Zambia to the southwest; and Rwanda, Burundi, and the Democratic Republic of the ...
Map of the world showing national-level sales tax / VAT rates as of October 2019. Additional local taxes may apply. [citation needed]A comparison of tax rates by countries is difficult and somewhat subjective, as tax laws in most countries are extremely complex and the tax burden falls differently on different groups in each country and sub-national unit.
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