Normally any PNM would count the same towards quota. Since there are benefits to taking a freshman, upperclassmen would be more likely to be cut early by more chapters. By counting upperclassmen differently it helps level the playing field.
For example 110/6 would make quota 19. A chapter would prefer those to be all freshman. But when counted differently you have have freshman quota of 17 and upperclassmen quota of 2.
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