|
Q25:
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:
------------------------------------------------
感到迷惑的地方是: 2 rows of 3, 每一排 要 由低到高 每一列後要比前高 那不就是 僅有一種的排序方式嘛? 我的理解漏洞在哪裡呢?
請協助~ 感謝~
| 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2009-4-20 21:42:00
