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<p>Not necessarily. MIT has arguably the best math department in the US and a very deep and talented pool of students. MIT actively recruit some of the top math talent in math from around the world including substantial number of IMO gold medalists. The Putnam Competition which pits the top 4,000 undergrads in math from hundreds of US colleges, MIT typically places 30 to 40 students in the top 100, about as many as the next 4 colleges combined. As an undergrad you can get into as much depth as you can handle including taking graduate level classes. So, if math is your thing, you can be infinitely challenged. On the other hand, as others have stated, you can also study many other things and many math majors double major in some field such as computer science or management.</p>