Probability Book For Beginner. I am a graduate school freshman.
I did not take a probability lecture.
So I don't have anything about Probability.
Could you suggest Probability book No matter What book level?

I think the book Probability Theory by Heinz Bauer is a very good text on probability theory. It contains an extensive discussion of all the basic parts of the theory and is very readable. The book requires, however, a modest background in measure theory. 
The original version of the book from 1973, Probability Theory and Elements of Measure Theory, contains all the necessary background in measure theory. Later versions of the book are split into two books, the parts on measure and probability theory are published as Measure and Integration Theory and Probability Theory, respectively. 
