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美梦成真:平板电脑又来了!注册就参与抽奖!连抽5天,每天2台,共10台!每邀请1个新用户注册多个抽奖号码,中奖概率翻倍!以上是某网站吸引人们参与活动的一个广告,其中涉及一些很有意思且容易答错的概率计算问题.这些问题的答案有些依赖于具体的抽奖模型.奖券总数的有限或无限,是区分这些模型的一个重要标志,也直接决定了问题的答案.类似的计算问题在中学数学中还有,甚至在高考题中都已有所涉及.下面笔者将一一展开.
Dream come true: Tablet PC again! Register to participate in the lottery! Even pumping five days, 2 units a day, a total of 10 units! Each invited a new user to register multiple draw numbers, winning probability doubled! An advertisement for people’s participation in the event, which involves some very interesting and easily miscountable probabilistic calculation questions whose answers are somewhat dependent on a specific lottery model. The limited or unlimited number of lotteries is an important indicator of the distinction between these models Directly determines the answer to the question.A similar calculation problem in secondary school mathematics, even in the college entrance examination questions have already been involved.The following will be carried out one by one.