<p>What I meant by “required” are classes for core, and classes your major specifically lists as required. For example, chemistry majors must take organic chemistry. Chem majors therefore cannot take organic chemistry on pass/fail. On the other hand, some majors will have a list of courses you can use to fullfill a requirement. In that case, you could take any of the courses pass/fail, but then you would need to take an additional class on grades to satisfy the requirement. I am not aware of any major which requires you to take a specific class and also allows you to take it pass/fail. </p>
<p>I did not go into humanities because the pass/fail rules for humanities/social sciences were being debated last year and I don’t know what the result of that was.</p>