Fraternities and Sororities Purdue has 46 fraternities and 24 sororities. Most members live in chapter houses, and membership is by invitation. Sororities provide an opportunity in the fall for interested women students to see each of the sororities, but the formal rush period for selection of new members is not held until just before the beginning of the second semester. The average number of women living in a sorority is 68. In the fall, the Interfraternity Council sponsors a Rush Convocation during which interested men can become acquainted with the fraternity system.
Open rush is conducted throughout the academic year.
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