A photographer will arrange 6 people of 6 differenct 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 ot him or her. How many such arrangements of the 6 people are possible?
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2004-5-19 17:11:00
