Symbolize the statement:

Sebastián will take a literature class or a composition class if and only if he is a classics major.

with the simple statements

p\displaystyle {p} -- Sebastián is a classics major
q\displaystyle {q} -- Sebastián takes a literature class
r\displaystyle {r} -- Sebastián takes a composition class

To enter logic symbols, use this key. Look at the preview to make sure you've entered the symbols correctly.

To enter...type...
\displaystyle \sim~ on the keyboard
\displaystyle \wedge^^
\displaystyle \veevv
\displaystyle \to->
\displaystyle \leftrightarrowharr