有答案 求大虾解释一下。。。不懂
A committee to monitor the effects of new policies on AIDS is to be formed from 3 Psychologists (Patricia, Peter, Pauline), 3 Physicians (Michael, Mary, Maureen), 2 Social Workers (Steve, Susan), and 3 Economists (Edward, Eileen, Edith). The committee must include exactly 2 Psychologists, 2 Physicians, 1 Social Worker, and 1 Economist. The individuals who make up the committee or group can vary from one meeting to the next. Peter cannot meet in the second half of any month. Furthermore, Maureen cannot be paired with Steve because they do not get along, and Pauline cannot be on any committee in which Steve is a member. Mary cannot meet on Wednesdays.
How many committees can be formed if Steve is a member?
A committee to monitor the effects of new policies on AIDS is to be formed from 3 Psychologists (Patricia, Peter, Pauline), 3 Physicians (Michael, Mary, Maureen), 2 Social Workers (Steve, Susan), and 3 Economists (Edward, Eileen, Edith). The committee must include exactly 2 Psychologists, 2 Physicians, 1 Social Worker, and 1 Economist. The individuals who make up the committee or group can vary from one meeting to the next. Peter cannot meet in the second half of any month. Furthermore, Maureen cannot be paired with Steve because they do not get along, and Pauline cannot be on any committee in which Steve is a member. Mary cannot meet on Wednesdays.
How many committees can be formed if Steve is a member?
- 2
- 3
- 9
- 10
- 12
- 1
- 3
- 9
- 12
- 18
- 3
- 6
- 9
- 12
- 15
