[用功] 離散數學之排列組合問題？
離散數學之排列組合問題？
(a) What is the number of arrangements of the letters in TALLAHASSEE?
(b) How many of these arrangements have no adjacent L's?
<Sol>
(a) 11!/(3!2!2!2!1!1!)
(b) [9!/3!2!2!1!1!]*C(10,2)
--------- ---------
(b) [11!/(3!2!2!2!)]－[10!/(3!2!2!)]
這樣寫對嗎？
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 163.17.10.177
※ 編輯: han999 來自: 163.17.10.177 (10/11 13:17)
推
10/11 13:24, , 1F
10/11 13:24, 1F
→
10/11 13:41, , 2F
10/11 13:41, 2F
推
10/11 14:26, , 3F
10/11 14:26, 3F
→
10/11 16:03, , 4F
10/11 16:03, 4F
推
10/11 17:00, , 5F
10/11 17:00, 5F
→
10/11 18:50, , 6F
10/11 18:50, 6F
→
10/11 18:51, , 7F
10/11 18:51, 7F
→
10/11 21:47, , 8F
10/11 21:47, 8F