Q2. A) Find the minimum number of students to be admitted to a college such that at least 1 of the 50 United States is represented by 20 or more students. B) A typical telephone number in the United States is of the form NXX NXX XXXX, where the Ns are digits other than 0 or I and the Xs are any digits. The first 3 digits constitute the area code. Find the minimum number of area codes needed to serve a 23-million-subscriber area. C) There are 20 small towns in a district. A group of 3 people have to be chosen from I of these towns. For this purpose, volunteers are solicited from all 20 towns. Find the minimum number of volunteers who must come forward