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在2013年第3期《中小学数学》(初中版)周杨的《抽签结果一定要同时揭晓吗》文中,讲述了这样的一个摸球游戏:某班要用摸球的方法,从已报名的5位同学中选出一人,代表班级参加学校组织的一次参观活动.遴选代表的办法是:把5只同样的乒乓球(只在其中一只球上做了不易察觉的特殊标记,下文将该球称为“目标球”)放入一个不透明的空纸箱里,将纸箱封闭并摇匀后,透过纸箱上预先留好的洞口,让这5位同学分别从中摸出一球,谁摸到那只目标球,谁就被确定为班级的代表.凑巧的是:第一位摸球的同学摸出球后就
In 2013 No. 3 “primary and middle school mathematics” (junior high school version) Zhou Yang’s “lottery results must be announced at the same time,” tells the story of a ball game: a class to use touch ball method, from the already registered One of the five students selected on behalf of the class to participate in a visit organized by the school.Method for selection of representatives is: the same five pingpong (only in one of the ball made imperceptible special mark will be The ball is called “target ball ”) into an opaque empty cardboard box, closed and shake the carton, through the pre-retained holes on the carton, so that the five students were to find a ball from them, Who touched the goal of the ball, who was identified as the class representatives. Coincidentally: the first touch the ball after feeling the ball