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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
排列組合數學問題
Aug 25th 2013, 08:10

要組合成7位數的＂奇數＂數字代表個位數字一定是3.而第一位不能是0.

個位數字為3:

XXXXXX3 將002233排列,6!/(2!2!2!)=90

但第一位不能是0,所以將第一位是0的狀況刪除:

0XXXXX3 將02233排列,[5!/(2!2!)]=30

所以答案應該是90-30=60才對...

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