排列 Flashcards by Harry Xu

Q

大毛、二毛、三毛、四毛4个人从左到右排队做游戏。三毛只能排在最左边。请问他们一共有多少种不同的排法呢？

A

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Q

5个小朋友比赛跳绳，每两个小朋友都要比赛一场（不能重复计算），一共要比赛机场？

A

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Q

A

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