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College offering Bsc.(hons) Mathematics
NC College of engineering
Arya post graduate college
IB Post graduate college
Here is the website which u find informative
There is only one college around Panipat, Karnal and Sonipat and all the cities around them offering B.Sc. Mathematics (Hons.) course. That college is Hindu Girls College, Sonepat.
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I hope this information helps you.