標題: [Core] 排列組合 5**題目 with solution [打印本頁] 作者: ANYF 時間: 2016-2-17 04:56 PM 標題: 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)
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 ..
