This quarter, we have several optional textbooks. You do not have to buy any of them, and we, in fact, recommend that you not buy or use all of them.
Bertsekas and Tsitsiklis. Introduction to Probability. ISBN 9781886529236
Rosen. Discrete Mathematics and Its Applications. ISBN 0072899050A small number of copies of our textbook may be available from the Engineering library or the Odegaard library on campus. You might be able to check them out for short periods to work on problems, but this may not be a reliable strategy long-term as your only access to a textbook. See this link.