Q33: A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row. The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her. How many such arrangements of the 6 people are possible? A. 5 B. 6 C. 9 D. 24 E. 36 Answer: 遇着复杂的概率题目总是绕不清,有没有哪位NN给我解答一下这题该怎么解?

穷举法就行了。右边的比左边的高，后面的比前面的高

问几种情况

1肯定在一排最左，6肯定在2排最右，5肯定挨着6，2肯定挨着1……

答案是A吧。不过5不一定要挨着6，可以站在6下面，2也不一定挨着1，可以站在2上面