第1个回答 2012-06-08
甲:火车代号:1,2,3 乙 4,5,6
123456,132456,213456,231456,312456,321456,
123465,132465,213465,231465,312465,321465,
123546,132546,213546,231546,312546,321546,
123564,132564,213564,231564,312564,321564,
123645,132645,213645,231645,312645,321645,
123654,132654,213654,231654,312654,321654,
共36种顺序
(幸亏不是100辆,分10组)本回答被网友采纳