I am looking at a past exam written by a student. There was a question I believed he got correct but received only 1/4. The marker wrote down "4 more compositions, order matters".
This is the problem:
List all 3 part compositions of 5. (recall that compositions have no zeros)
$(1, 1, 3) (1, 2, 2) (1, 3, 1) (3, 1, 1) (2, 1, 2) (2, 2, 1)$ (what the student has on paper) EDIT: I made some mistakes copying
My guess is that the student wrote only (1,1,3) and (2,2,1) ,but corrected it after exam was returned. I just want to make sure that this is the case, so that I don't miss something.