the boys are :A B C D E
the girls are :F G H I J
更新1:
002 maybe F A B G C H D I E J
maths maths maths
2010-08-07 3:46 am
how many ways can you arrange 5 boys and 5 girls in a row such that no two girls are adjacent to each other?
the boys are :A B C D E
the girls are :F G H I J
the boys are :A B C D E
the girls are :F G H I J
回答 (2)
2010-08-07 4:31 am
✔ 最佳答案
Step 1 : Arrange 5 boys total 5! = 120 ways ,For example : _ A _ B _ C _ D _ E _Step 2 : Insert 5 girls to any 5 from 6 positions ' _ ' , total 6P5 = 720 ways , for example F A _ B G C H D I E JThe answer is 120 * 720 = 86400 ways. 
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https://hk.answers.yahoo.com/question/index?qid=20100806000051KK01494