<p>The Undergraduate Bulletin (<a href=“http://www.unc.edu/ugradbulletin/procedures1.html[/url]”>An opportunity to make a difference - The University of North Carolina at Chapel Hill) seems to indicate that there are some courses, such as the one you refer to, in which only the grades of PS and F are assigned. In this case (as well as elected PS/D+/D/F), the course will not count toward you GPA if you earn a “pass,” but will count toward you GPA in the usual way if you do not.</p>
<p>In terms of calculating GPA, note from the above link: “If a student is permitted to repeat a course in which a passing grade previously has been earned, only the credit from the course with the highest grade (or if the grades are the same, the latter attempt) will be counted toward the fulfillment of the University’s minimum graduation requirement of 120 academic hours. The grades of both courses, however, will be computed in the student’s cumulative grade point average.”</p>
<p>In other words, both attempts count toward your GPA, but you will not receive additional hours toward the satisfaction of the minimum graduation requirement of 120 academic hours if you repeat a class you’ve passed. When manually calculating your GPA, you would omit a P/F class if you’ve earned a passing grade.</p>