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古典概型是一种最基本的概率模型,也是学习其它概型的基础.现将求解古典概型常见的错误剖析如下.一、“有序”与“无序”混同,导致基本事件的个数求错例1从10件产品(其中次品3件)中,一件一件地不放回地任意取出4件,求4件中恰有1件次品的概率.错解因为第一次有10种取法,第二次有9种取法,第三次有8种取法,第四次有7种取法,由乘法原理可知从10件取4件共有10×9×8×7种取法,故从10件产品(其中次品3件)中,一件一件地不放回地任意取出4件含有10×9×8×7个可能的
Classical Probability is the most basic probabilistic model and the basis for learning other Probabilities. Common mistakes in solving Classical Probability are as follows: First, the mismatch between “ordered ” and “disorder ” results in The number of basic events in the wrong example 1 from 10 products (including 3 defective), one by one without leaving back to the arbitrary 4 out of four, find the right one defective defective. The solution is that there are 10 ways to take the first time, 9 ways to take the second time, 8 ways to take the third time, and 7 ways to take the fourth time. × 7 kinds of extraction method, it is from 10 products (including defective 3), one by one without leaving back to the arbitrary removal of 4 containing 10 × 9 × 8 × 7 possible