n个男生，m个女生排成一排(m≤n+1).求事件A= TExample 任意两个女孩不相邻}的概率。又若排成一圈，又如何？ ↓Example 解： Previous Next First Last Back Forward 9↑Example n 个男生, m 个女生排成一排 (m ≤ n + 1). 求事件 A = {任意两个女孩不相邻} 的概率。又若排成一圈，又如何? ↓Example 解:(1) 排成一排 |Ω| = (n + m)!, |A| = n!C m n+1m! P(A) = |A| |Ω| = n!C m n+1m! (n + m)! (2) 排成一圈 |Ω| = (n + m − 1)!, |A| = (n − 1)!C m n m! P(A) = |A| |Ω| = (n − 1)!C m n m! (n + m − 1)! Previous Next First Last Back Forward 9