hey,
i hope you are doing well
to be eligible for B.A economics hons you must have studied mathematics subjects in your 10+2 and you must have secured a minimum aggregate of 60 percent marks or more in one language subject from the list A1 and combination of best three subjects from the list A and list B , if you don't take economics subjects then there will be a deduction of 1 percent on aggregate of best four.
for more detailed information kindly refer to the link mentioned below
https://university.careers360.com/articles/du-eligibility-criteria
good luck!
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