照这么说20-30球间一定是25个?40-50个球之间是49个?101-110之间不存在这样的等概率事件?何况这样的方程右边解决了,左边怎么办?
照这么说20-30球间一定是25个?40-50个球之间是49个?101-110之间不存在这样的等概率事件?何况这样的方程右边解决了,左边怎么办?
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