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一、对有序与无序判断不准确例1甲、乙两人参加普法知识竞赛,共有10道不同的题目,其中选择题6道,填空题4道.甲、乙两人各抽取1道题,则甲抽到选择题、乙抽到填空题的概率为____.错解甲抽到选择题、乙抽到填空题的可能结果有C_6~1C_4~1=6×4=24种.甲、乙两人依次抽取1道题的可能结果有(C_(10)~1C_9~1)=(10×9)/2=45种.所以,甲抽到选择题、乙抽到填空题的概率P=(24/45)=8/(15).
First, the judgment of order and disorder inaccurate Example 1 A, B two people participate in the knowledge of legal knowledge competition, a total of 10 different topics, including multiple choice 6, fill in the blank 4. A and B two each take a Problem A, then A to multiple choice, B to fill the blank problem probability ____ wrong solution A to multiple choice, B to fill in the blank may have the results C_6 ~ 1C_4 ~ 1 = 6 × 4 = 24 species. A, B and B in order to extract one of the possible results (C_ (10) ~ 1C_9 ~ 1) = (10 × 9) / 2 = 45. So, A to multiple choice, B drawn to fill in the blank The probability P = (24/45) = 8 / (15).