[理工] [離散]-92清大-資應所

看板Grad-ProbAsk作者 (無法顯示)時間15年前 (2010/11/21 21:28), 編輯推噓3(303)
留言6則, 4人參與, 最新討論串1/3 (看更多)
determine the number of ways to distribute 2t+1 indistinguishable coins to three boys so that any two boys together will have more coins that the other one 請問這題用排列組合要怎麼解? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.228.29.35

11/21 21:44, , 1F
不知道可不可以x1+x2+x3=2t+1 x1<x2<=x3
11/21 21:44, 1F

11/22 00:09, , 2F
任兩個都不會比對方多嗎? that是than嗎?
11/22 00:09, 2F

11/22 00:10, , 3F
這樣X1會=X2=X3???
11/22 00:10, 3F

11/22 00:11, , 4F
看錯了= =
11/22 00:11, 4F

11/22 00:11, , 5F
應該就是三個的範圍都介在1~t 然後相加=2t+1
11/22 00:11, 5F

11/22 02:05, , 6F
我跟樓上想的一樣
11/22 02:05, 6F
文章代碼(AID): #1CwHvu3W (Grad-ProbAsk)
文章代碼(AID): #1CwHvu3W (Grad-ProbAsk)