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一、问题的提出首先看几个具体的实例:例1用4个1号球,3个2号球,2个3号球摇出一个9位数的奖号,共有多少种可能的号码?例2有6×6的方格中停放3辆完全相同的红色车和3辆完全相同的黑色车,每一行每一列只有1辆车,每辆车占1格,则停放的方法有多少种?例3 8人参加百米赛跑,若无同时到达终点情况,则甲比乙先到,乙又在丙之前到达的情况共有多少种?例4 7个人站成一排照相,其中甲、乙、丙三人身高各不
First, the question raised First look at a few specific examples: Example 1 with 4 1 ball, 3 2 ball, 2 3 ball shake out a 9-digit prize number, the total number of possible number? Example 2 There are 3 identical cars and 3 identical black cars parked in a 6 × 6 checkered grid. Each row has only 1 car in each row, and each car occupies 1 square. How many parking methods Example 3 Eight people participated in the 100-meter race. If there were no simultaneous arrivals, how many cases would be reached before B and B were reached? C 4 7 Individuals standing in a row with A, B, C three different height