Ben and Ann are among 7 contestants from which 4 semifinalists are to be selected. Of the different possible selections, how many contain neither Ben nor Ann?_出国考试答疑器_GMAT_试题

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题目：

Ben and Ann are among 7 contestants from which 4 semifinalists are to be selected. Of the different possible selections, how many contain neither Ben nor Ann?

选项:

A、5

B、6

C、7

D、14

E、21

答案:

A

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