Probability

This textbook is ideal for an undergraduate introduction to
probability, with a calculus prerequisite. It is based on a course
that the author has taught many times at Berkeley. The text's overall
style is informal, but all results are stated precisely, and most are
proved. Understanding is developed through intuitive explanations and
examples. Graphs, diagrams, and geometrical ideals motivate results
that might otherwise look likely purely formal manipulations.