I'm planning to apply as a finance and CS major, but I know those have very saturated number of applicants, so I wanted to see if its a) recommended (basically is finance and CS a good overlap and b) does it affect my chances of getting into big colleges
Have you looked at the application to see if you're even able to apply with a double major? I think most schools have you apply under a single major or they ask you to list your top choices.
Is your application better suited for one major compared to the other? If so, I would just apply under that major. It will be hard to have an application that is competitive in both Finance and CS. Instead, you can pick a "primary" major to focus on for your application and then some of your ECs and class choices can reflect you're also passionate about your "secondary" major.
In terms of your chances, I don't think applying as a double major would have a major impact but I'm also skeptical you can even apply as a double major in the first place.
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Oh good point, I hadn't even considered that aspect. Aren't there like dual degree programs though, a lot of the integrated Business & Engineering programs for instance? Ex: M&T by UPenn. Those are probably a lot harder though. If you cant apply as a double major, how can you do a double major at a school otherwise?