My first reaction to this book was that the problems were very, very difficult to solve, and I believed that it was mainly do to the author's fault of not presenting effective methods for handling the problems in a step by step manner. However, I now believe that after reading more texts on the subject, that introductory level probability problems, in general, require a greater deal of mathematical reasoning and careful application of the rules of probability than do other introductory problems in the realms of calculus and physics where the problems are of a 'plug-in' nature. So in defense of Dr. Ross, I must say that his text is well thought out with interesting, careful examples and written concisely and fluently (if at times somewhat condescending on the reader).