Greek life is present at Carnegie Mellon, but it isn't what defines the campus. It isn't uncommon to meet people in classes that are Greek, you them out and about during recruitment weeks, and they host some events throughout the school year, but by no means would it be surprising for someone to not be affiliated with a fraternity/sorority. I personally don't know too much about what it is like within the Greek scene as I am decidedly not involved, but I do know some people that have gone Greek and loved it.
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