<p>Does anyone know which edition of Rosen's Discrete Mathematics and Its Applications is used for Math 55? Is it the 6th?</p>
<p>It’s the 7th edition. The edition is super expensive though - if cost is an issue, come buy the International edition from me for $30! The page numbering is off, but what I did was photocopy the homework questions/ answer key from the library at the beginning of the semester.</p>