[理工] 101 中山 離散 5
想問第五題
從（0,1)走到（10,3)只能斜上或斜下
碰到或穿過x軸有幾種走法？
只知道要往下比往上多
式子不知道怎麼列
感謝大家
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 223.140.205.155
※ 文章網址: https://www.ptt.cc/bbs/Grad-ProbAsk/M.1484487020.A.9E0.html
推
01/15 21:37, , 1F
01/15 21:37, 1F
→
01/15 21:37, , 2F
01/15 21:37, 2F
→
01/15 21:38, , 3F
01/15 21:38, 3F
→
01/15 21:38, , 4F
01/15 21:38, 4F
→
01/15 21:41, , 5F
01/15 21:41, 5F
→
01/15 21:45, , 6F
01/15 21:45, 6F
→
01/15 21:54, , 7F
01/15 21:54, 7F
→
01/15 21:57, , 8F
01/15 21:57, 8F
→
01/15 21:57, , 9F
01/15 21:57, 9F
→
01/15 22:00, , 10F
01/15 22:00, 10F
→
01/15 22:01, , 11F
01/15 22:01, 11F
→
01/15 22:04, , 12F
01/15 22:04, 12F
→
01/15 22:38, , 13F
01/15 22:38, 13F