Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Avoid this book!

Of all math books I've had, this one is the most poorly written. The style is erratic, some of the least important versions of formulas are boldened, while the ones you actually use may be buried within the text. The examples make non-obvious transformations or 'pull rabbits out of a hat'. The problems are often poorly worded or open to varying interpretation, and the 'solutions' in the back are often just a number like ".30239" for a problem that might have 5 parts and take a whole page to compute. In fact, the solutions of every chapter in the book take merely 3 pages.Some reviewers say this is one of the best books for beginners in probability, and if that is true, then the world of mathematical instruction is in a sorry state.