[理工] [機率] 排組
John throws 3 balls randomly into 5 boxes.
what is the probability that a box contains at least 2 balls?
這題是高成老師書上的
P(A)= n(A) / N
我的問題是 解答上分母 是分母N
是否可用重複組合 也就是H(5,3)?
解答上試用重複排列 好困惑 = = 5^3
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