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题库 / Prep2007E1-PS-43
A committee of threepeople is to be chosen from four married couples. What is the number of different committeesthat can be chosen if two people who are married to each other cannot bothserve on the committee?
16
24
26
30
32
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8选3,无条件=C8 3=56
条件取反=C41*C61=24
56-24=32
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