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Number theory.

• brintnc 7y ago
  This. I went into my 400 level cryptography class with 0 Number Theory knowledge as it wasn't a prerequisite. Big mistake, it should've been. My lowest grade in college and I still busted my ass. That being said, it was incredibly interesting and I do not regret it.
  • auiya 7y ago
    Ditto, I ended up taking the course twice.