If a committee of 3 people is to be selected from among 5 married couples so that the committee does not include two people who are married to each other, how many such committees are possible?
20
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120
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C10,3 - 10*C4, 3; 先看一共几种选法，减去有couple的可能性
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C10,3 - 10*C4, 3; 先看一共几种选法，减去有couple的可能性
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