**Supplementary materials**

Course syllabus (Lecture 1)

Student questionnaire (Lecture 1)

Catalan numbers, the Second proof resembles what we did during Lecture 5.

Practice midterm (given in Math 180, Summer 2011) and solutions.

The midterm from October 26, 2011 and its solutions.

Solutions to selected homework problems can be found here.

Answers to homework problems are at Humberto's website.

The notes for the last three lectures: Ramsey theory and Matchings.

Final exam practice: sample True/False questions. Answers to the T/F questions.