Example 4.2
For this problem, is it enough to show work as: 7 X 6 X 5 X 4 = 840, or is there any other work that needs to be shown?
weisbart: Jan. 15, 2015, 5:35 p.m.
Don't really need to show work. You could explicitly write down the sets you use that you are counting if you like, but that seems clear from the answer.