1, first of all, we can discuss it together and see individual needs. Everyone should be modest, because you are classmates and colleagues after all, and you will work together in the future. Don't hurt your feelings for this matter.
If we can't negotiate well, it's fair to work out how much rent we should pay according to the market price. It can be calculated according to this ratio: 3000+3000+2000, the master bedroom and the big second bedroom are both 3000, and then the smallest second bedroom is 2000. Because the big second bedroom is smaller, but it is not worse than the master bedroom. The master bedroom and the second bedroom cost the same. After all, the second bedroom has a balcony.
The last way is to draw lots to see who is lucky. ?