Hope you are doing great as per the question asked by you no you can't do B.SC with both animation and maths together as both are separate full time degrees and you can't do two full times degree together. You should certainly choose one among both of them.
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Nope! In India there are no such courses which gives you Animation and Mathematics as a part of the course. BSc Mathematics as well as BSc Animation both are 3 years graduation program. So if you want to pursue a course then you have to choose anyone from this two. If you are interested in BSc Mathematics go for it. BSc Mathematics is a academic subject and you can have very good perspective in research as well as academics or industrial application after MSc. If you go for BSc Animation then after the course you can get to work in different fields such as VFX, Visual Effects, Gaming production etc.
Thus as you can see both the fields have a lot of scope what you have to do is to choose the right subject for you based on your interest and future ambitions.
To know more about Mathematics courses visit the link below:
TO know more about Animation courses visit the link below:
I hope this answer helps. All the very best for your future endeavors!