The definition and quality of conditional probability of fuzzy events were given. The total probability formula of fuzzy events in general division of sample space was also given.
给出f事件的条件概率定义和性质，并在基本空间普通划分下给出f事件的全概率公式。
This peper use heuristic modes of teaching to design the teaching of total probability formula. This method raise the effectiveness of teaching.
本文利用启发式教学法，对全概率公式教学进行了启发式的教学设计，提高了教学效果。
The secretary problem is a very typical and interested optimal stop problem. In this paper we give a primary solution about secretary problem by formula of total probability.
秘书问题是典型而又有趣的一类最优停止问题。本文用全概率公式给出秘书问题的一种初等解法。
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