排列 Flashcards

1
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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2
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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3
Q
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