Question 28
Mindanao, the second-largest island in the Philippines, is divided into six administrative regions: the Zamboanga Peninsula, Northern Mindanao, the Caraga region, the Davao region, Soccsksargen, and the autonomous region of Bangsamoro. How many students, each of whom comes from one of the six administrative regions, should participate in the CISMO-Mathematics National Round to guarantee that there are at least 100 students who come from the same region?