For the last three editions of this book, nothing has changed. Hibbeler simply removes and changes problems sets. This book contains the exact same information as the 10th, 11th and 12th additions. The only difference is the order of problems. There is seemingly a pool of problems that Hibbeler pulls from at random to make different "editions" of his book. It's an embarrassing example of the criminal organization that is running college textbooks, requiring students to waste hundreds of dollars a semester when absolutely no new information is provided. Hibbeler is a crook, no one should be forced to buy this book and I hope the system changes soon.
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