In a classroom, there are 8 desks equally arranged in two columns (i.e. each column has four desks). Each desk can accommodate 2 people and there are eight boys and eight girls in total. When two opposite genders share a desk, we call them group 1 and when two same genders share a desk we call them group 2.
The following is one possible way of sharing the desks, where O represents male, + represents female and -- represents the desk
O+ O+
-- --
OO OO
-- --
O+ ++
-- --
O+ ++
-- --
Now the question is, what is the percentage of group 1 in first and second column?
For the first column, I would count the frequency of group 1 (i.e., 3) and divide it by total number of pairs present in the classroom (i.e., 8) and multiple it with 100, which would give me 37.5%. Hence as per my calculation, I would say that there are 37.5% of group 1 in the first column and 12.5% of group 1 in the second columns.
Am I doing it right? If not, please let me know the correct way of calculating the percentage of group 1 for each column?