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<p>It’s actually not so simple. In the event that you fulfill the requirements for two departments (which means writing two theses), you pick one of the departments, and that’s what it says on your diploma. But on your resume, you can still list both majors. Double majors are very rare – I’ve only met one in my three years at Princeton, and he was an absolute god academically. So long story short, don’t plan on double majoring at Princeton.</p>