This popular problem collection is now available in paperback to be used for self study and in conjunction with basic courses in probability and statistics. Its strength lies in the originality of the problems which have been extensively tested in teaching by the author and others.
This is a great text to draw interesting statistical questions from. It asks you the questions in a particular order, you have to solve the, and at the end of it all you understand probability theory better. I would recommend that every master student and PhD student have this somewhere on their shelf.