请教gwd6-3

ytrrew

Q3: 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?

A. 20 B. 40 C. 50 D. 80 E. 120

himba

任选3个 C（3，10）

其中有一个是一对 C（1，5）C（1，8）

C（3，10）- C（1，5）C（1，8）=120-40=80

选D

sammen

严重同意。是任选3个人得选法减去有1对得可能。