What you major in is irrelevant. B-schools aren't looking for math geniuses. They're looking for well rounded people who are accomplished outside the classroom.
If you think of college archetypes, they'd rather take the B-average student body president over the A+ physics geek.
So major in whatever you are most interested in. Not what you think impresses others.
As for jobs in finance, whatever shade of "math/quant" isn't what will get you the interview. If you want to work at a top bank, it'll come down to whether they recruit at your college (and if they don't, then it's not about your math skills, but about whether you know someone on the inside and can schmooze your way through the back door). And if they do recruit at your school, then it comes down to the interview which has a lot to do with your ability to communicate and interact with people.
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