Hello,
The first thing is for UPSC, the eligibility is graduation. It doesn't specify the subjects for graduation. So you may pursue graduation in any subjects of your choice.
If you like both Mathematics and Economics, then according to UPSC syllabus, very basic maths (till class 10) is asked in CSAT. But the economics covers major portion of UPSC. So I will suggest you to pursue Economic hons. as it will benefit you in pre as well as mains. Rest depends upon your own interest.

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