I have never seen the "peeling off" technique that was used in both this chapter and in class today. While clever, it seems borderline sloppy - like you're purposely losing information in order to prove something else.
I didn't realize that factorials were a math tool not introduced until college. I think I saw them first in fifth grade. Although, that may have been because my dad showed them to me and not because we actually learned them in class... Though I have definitely seen them between then and now, so it's interesting to me that it is being introduced in this section.
-Batman and her sidekick: the Great Mr Alpha
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