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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 ...
The Antonov An-2 ( USAF/DoD reporting name Type 22, [5] NATO reporting name Colt [6]) is a Soviet mass-produced single-engine biplane utility/agricultural aircraft designed and manufactured by the Antonov Design Bureau beginning in 1947. [4] Its durability, high lifting power, and ability to take off and land from poor runways have given it a ...
Retrieved 22 April 2024. ^ "International Comparisons of Defence Expenditure and Military Personnel". The Military Balance. 124 (1): 542–547. 31 December 2024. doi: 10.1080/04597222.2024.2298600. ISSN 0459-7222. ^ "Why Russian Military Expenditure Is Much Higher Than Commonly Understood (As Is China's)". War on the Rocks. 16 December 2019.
Fukushima nuclear accident. Coordinates: 37°25′17″N 141°1′57″E. Fukushima nuclear accident. Part of the 2011 Tōhoku earthquake and tsunami. The four damaged reactor buildings (from left: Units 4, 3, 2, and 1) on 16 March 2011. Hydrogen-air explosions in Units 1, 3, and 4 caused structural damage. [ 1] Date.
A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.
In mathematics. Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 1 2 + 7 2 = 5 2 + 5 2 (the former is the sum of squares of divisors of 7 ). [1] It is also the sum of three squares, 50 = 3 2 + 4 2 + 5 2 (that feature in the smallest Pythagorean triple ), and the sum of four squares, 50 = 6 2 ...