Search found 2 matches
virtualM,
Your equation suggests that each person works on both type of rooms in the same hour and this is not correct.
- by rs123
Wed Jan 31, 2007 12:08 pm- Forum: Problem Solving
- Topic: PS: Hotel rooms
- Replies: 5
- Views: 3619
It is simply
8C2 * 6C2 * 4C2 * 2C2 / 4!
8!/(2! * 2! * 2! * 2! * 4!)
8C2 * 6C2 * 4C2 * 2C2 means you keep on selecting 2 at a time. We need to divide by 4! because a combination like AB, CD, EF, GH could be permuated among itself in 4! ways.
HTH
- by rs123
Tue Jan 30, 2007 9:00 am- Forum: Problem Solving
- Topic: probability
- Replies: 8
- Views: 3659