【GMAT考满分数学PS题库】Arrange six letters h,t,l,a,o,s in a row, among wh_真题_答案_解析 GMAT考满分官网

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题目内容

Arrange six letters h,t,l,a,o,s in a row, among which the letters in the first, second and fourth positions can only be selected from the three letters--h,t,l. How many arrangements are there?

A18
B36
C48
D72
E108

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正确答案: B

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