There are 6 boys and 6 girls. How many ways are there to divide them into 6 groups with 1 boy and 1 girl in each group?
Ans.: 6!
I do not understand why this is the answer, please explain it to me, thanks!
收錄日期: 2021-04-23 21:22:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110620000051KK00825