I'm Andrew, a first year math graduate student. This quarter I'm a teaching assistant for Math 61 Discrete Structures.
I wrote up examples of various proofs and proof techniques so you can get a feel for what a proof should look like. Here it is. (PDF 141KB)
Week 2 Worksheet (PDF 83KB)
Week 2 Worksheet Answers (PDF 96KB)
Week 3 Worksheet (PDF 44KB)
Week 3 Worksheet Answers (PDF 106KB)