Class Placement?

Colleges & Universities California Institute of Technology
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<p>on this page: <a href=“http://www.math.caltech.edu/courses/1term05.html[/url]”>http://www.math.caltech.edu/courses/1term05.html&lt;/a&gt;&lt;/p&gt;

<p>what is the difference between math 1a and math 1a (section 1)?</p>