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https://en.wikipedia.org/wiki/Coupon_collector%27s_problem the coupon collector's problem describes the "collect all coupons an...
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智力题以及概率题 - Backyard of LixinZhang 一个是如果两个质数中间只有一个数,那么证明他能被6整除? 分析 G,E,A,B,C,D,F 设三个数为A,B,C。因为A,C为质数,一定不是偶数,则B一定为偶数。 因为不长为三的一定会出现被3整除的数字...
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In modular arithmetic , the modular multiplicative inverse of an integer a modulo m is an integer x such that That is, it is t...
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The order statistics would be denoted where the subscript ( i ) enclosed in parentheses indicates the i th order statistic of the s...
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Let π ( x ) = # { p ≤ x ∣ p is prime } be the prime counting function. The Prime Number Theorem tells us that π ( x ) ∼ x log x . (Tha...
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Puzzles, Maths and Algorithms: Stick Breaking Problem Set 1 : Given a stick of length 1 meter. It is cut into two parts randomly. Probl...
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明天太阳照常升起的概率是多少? 在第三章"概率计算的一般原则"最后提到一个日出问题: 如果我们不了解太阳运行的基本规则,根据统计,在过去的N天里,太阳每天都正常升起。那么,太阳明天照常升起的概率是多少呢? 拉普拉斯在书中,指出蒲丰在著作《政治算术》中的结果 1...
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http://www.cr173.com/html/18295_1.html 第一种、第二种模型 分析右上角的的2,其周围的未知块a,b两块,等于其周围雷数,故可判断出a,b都是雷;接下来,分析下面的2,其周围共有3个未显示的块a,b,c,其中a,b已判断出为雷,即...
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You can calculate the Dot Product of two vectors this way: a · b = | a | × | b | × cos(θ) OR you can calculate it this way: a ...
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