 But if a region has the best team for every given seed, its seeds would add up to 28, and a region with the weakest team in every seed would add up to 40, making the two regions very unbalanced.It is extremely unusual that an at-large bid can be lower than a #12 seed, but it has occurred, most recently with BYU and Iona being #14 seeds in the 2012 Tournament.While the seeds are almost never perfectly balanced throughout the four regions, the committee strives to ensure that they differ from each other by only a few points.