## Example 4.2 |
pdasari09 |
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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. |
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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. |