GMAT 考满分题库

Magoosh - 数学PS - 289
Six children-A, B, C, D, E, and F-are going to sit in six chairs in a row. Child E must be somewhere to the left of child F. How many possible configurations are there for the children?
  • A60
  • B180
  • C240
  • D360
  • E720
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正确答案: D

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