I was wondering. Is it possible for someone to major in Maths as in do their masters in Maths once they've earned their degree in Computer Science?

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    This particular stackexchange site is about the computer software Wolfram Mathematica. – Sascha Jun 13 '16 at 9:06

Yes, you can. I know several people who have switched their graduate degrees, e.g. Math -> Computer Science, Biology -> Chemical Engineering, etc. You might have to take some extra classes, though.