What class am I most prepared for?

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I've only taken up to calc 3, discrete, and linear algebra. Which course am I most prepared for? I'm going to be taking differential equations and advanced calc, but I want to take a 3rd class. I can choose from combinatorics, elementary number theory, and euclidean/noneuclidean geometry. Any advice is appreciated!

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If Advanced Calculus is your introductory analysis course, that's a tough one. I personally am not an analyst and favor combinatorics/graph theory instead. I find them to be at the opposite ends of the spectrum. Elementary Number Theory going to start off probably very familiar, if you've seen divisibility proofs, modular arithmetic, and the Euclidean Algorithm. You get into topics like quadratic residues, the Chinese Remainder Theorem, and a bit into the discrete log problem. I think Number Theory is probably the easiest out of the three. I'm not a geometer, so I'd personally avoid geometry.

If you're pursuing a Discrete Math or Computer Science track, I'd go for Combinatorics or Number Theory.

This is probably more comment material, but the post is too long. Hope this helps some!