Where are the exercises in book a reference?

The location of exercises in a book varies greatly depending on the book's structure and style. There's no single answer. Exercises might be:

* At the end of each chapter: This is the most common placement.

* At the end of each section: Some books break chapters into sections with exercises after each.

* In a separate section at the end of the book: This is less common but happens sometimes, especially for larger textbooks.

* Interspersed throughout the chapter: Some books include short practice questions within the text itself.

* Online: Many modern textbooks have supplementary online materials, including exercises, which are referenced in the book.

To find the exercises, you need to consult the book's table of contents or index. Look for headings like "Exercises," "Problems," "Review Questions," "Practice Problems," or similar. The book's preface or introduction might also explicitly state where the exercises are located.