概率概念是概率论与数理统计教学过程中的难点。本文给出概率的三种定义，通过对其用途的剖析和阐述，说明掌握了这三种定义，基本上就掌握了概率的概念。%Concept of probability is difficult in the teaching course of probability theory and mathematical statistics. The three kinds of definitions of probability are given in this paper. By analysis and explanation of its uses, we illustrates that the command of the three kinds of definitions basically grasp the concept of probability.
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