consider the word 'COMPUTER'
(a) how many ways are there to arrange the letters of word "COMPUTER" in a row?
(b)How many ways are there to arrange the letters such that "C" , "O" and "M" are placed together?
數學一條 急用 please!! 10點
2015-03-21 8:46 pm
回答 (1)
2015-03-21 9:12 pm
✔ 最佳答案
(a) number of ways=8P8
=40320
(b) number of ways
=6P6*3P3
=4320
6P6係因為當"COM"綁埋一齊, 有6個可以排列：
"COM" "P" "U" "T" "E" "R
3P3係因為"C" "O" "M" 3個字母可以再排列
收錄日期: 2021-04-15 18:47:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150321000051KK00036