Question #b13c2
1 Answer
Sep 16, 2016
Let's call them A1, A2, A3 for maths, B1, B2 for physics, and C1, C2 for philosophy.
Explanation:
Within the groups there are 6 posibilities for the A-group:
123, 132, 213, 231, 312, 321
For the other groups there are only 1,2 and 2,1.
The groups themselves can be ordered in 6 ways (as for any 3 items).
For the total number of orders we multiply all possibilities:
Extra : the total number of orders if groups don't have to stay together is: