Moon Daisy profile image 83

Why do people use 101 in educational courses? (Eg. Psychology 101). I've also seen 202 and 303.


I get that 101 is a beginner's class, but why? And where does this numbering come from. Why not say Psychology 1, and then Psychology 2 etc..? I think it's an American thing, but I've never understood it.

 

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