Will I have to retake the 31 series? Switch from bio to stats

I am currently a biology major, but want to switch to statistics at the end of next quarter. I will take math 3B next quarter, and then hopefully 32A in the spring. The prereq for 32A says 31A, but I already have credit for 3A/31A, so I cannot take 31A for credit. Will I have to retake 31A and 31B to take 32A?

why not ask a counselor in L&S or the Stat dept advisor?