※ 引述《C2H (christine81420)》之铭言： : 想请教一个数 学问题 : 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 : 答案是A 不清楚怎麽得到的 : 想请教一下 : 谢谢^^ 身高高度由左到右增加，第二排的又会比第一排高 可以分成以下几种: 456 246 346 256 356 123 135 125 134 124 最矮的1和最高的6不要变，其他只要按照题目给的就可以罗! ^_^ --

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