A BA in a science is a BS with the math and other difficult parts removed.
I said that was true for institutions which offered both. And even then, it's not that math is removed -- it's that a couple of upper-level courses covering esoteria are removed to make room for a better grounding in the humanities.
My friends with BAs in math did the full gamut of differential and integral calculus, number theory, differential equations, analysis, linear algebra, statistics, and more. Even as a CompSci major I took differential and integral calculus, differential equations, and statistics.