What was the most difficult part of the material for you?
I had a hard time understanding the proof at the end of 4.1. I didn't follow a few steps in the manipulation of the expression for n to make it look like 2a+3b. I reread it and realized that's what was happening.
What is the most interesting part of this material for you?
The most interesting part for me was the section on congruence of integers. I learned about modular arithmetic in high school just so I could get the right answer for questions in science bowl. Now I better understand the mathematical purpose of modulo.
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