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[Core] 排列組合 5**題目 with solution

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排列組合 5**題目 with solution

5 boys, 3 girls are sitting a row. Find the number of seatingarrangement if
(a)
No restriction
(b)
No two boys can sit next to each other
(c)
No two girls can sit next to each other
(d)
One of the boy are super annoying, no girls are willing to sit next to him
(e)
Both restriction in (c) and (d)


Solution:
https://www.youtube.com/watch?v=QG-t9ZKuxqw

[ 本帖最後由 ANYF 於 2016-2-17 05:52 PM 編輯 ]
   
4AL 4A

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But you should define the question more clearly whether in (a) you consider boys as identical objects or non-identical.
Sorry, I didnt watch the video. Just see that you said nCr => so ..

[ 本帖最後由 yeungwk91 於 2016-2-17 05:42 PM 編輯 ]

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Thanks, i change the name of title, 不過因為一向男女都係DIFFERENT OBJECTS 我無特別寫明,
所以改番title 免誤會, thanks for reminding
4AL 4A

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(e) what happen if the one annoying is seating in both end?

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