<p>Extension courses prefixed with XB are equivalent to regular courses of the same course numbers, while those prefixed with X are not.</p>
<p>[Information</a> and Policies — UC Berkeley Extension](<a href=“http://extension.berkeley.edu/info/grades.html]Information”>http://extension.berkeley.edu/info/grades.html)</p>
<p>None of the current Extension math offerings are XB prefixed:</p>
<p>[Mathematics</a> and Statistics courses - UC Berkeley Extension](<a href=“http://extension.berkeley.edu/catalog/math.html]Mathematics”>http://extension.berkeley.edu/catalog/math.html)</p>