Which is better? What counts as a year?
I know 3 ABC is a year, but what about 31 and 32? What is the big difference?
31A-31B-32A is also a year. 32A is multivariable calculus. 3C is probability. 31/32 tends to be required for engineers and the physical sciences whereas the 3 series tends to be taken by life science majors.