One ordering of the leters T,U,V and W from left to right is UTVW.What is the totaal number of ordering of these letters from left to right,including UTVW?

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One ordering of the leters T,U,V and W from left to right is UTVW.What is the totaal number of ordering of these letters from left to right,including UTVW?

One ordering of the leters T,U,V and W from left to right is UTVW.What is the totaal number of ordering of these letters from left to right,including UTVW?
One ordering of the leters T,U,V and W from left to right is UTVW.What is the totaal number of ordering of these letters from left to right,including UTVW?

One ordering of the leters T,U,V and W from left to right is UTVW.What is the totaal number of ordering of these letters from left to right,including UTVW?
一共有:4*3*2*1 = 24种排序.
左边第一个字母有4种选法(T, U, V, W 4个字母选一个),然后第二个字母有3种选法(此时只有3个字母可选),然后第3个字母有2种选法,最后只有一个字母,所以共有 24 种排序.
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A(4,4)=4*3*2*1=24

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