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概率是研究随机现象的数量规律的科学,它的理论和方法已成为研究国民经济和科学技术不可缺少的工具,在中学阶段学一点概率的基本知识是完
Probability is the science of studying the law of the quantity of random phenomena. Its theory and methods have become indispensable tools for the study of national economy and science and technology, and the basic knowledge of learning a bit of probability in the middle school stage is finished.