Question

(u. A total of 60 students studying in a mathematics library are interviewed as to what courses they are taking this semester. Here are the responses: 26 students are taking mathematics. 35 students are taking computer science. 28 students are taking statistics. 15 students are taking mathematics and computer science. 13 students are taking mathematics and statistics. 18 students are taking computer science and statistics. 7 students are taking all three. (a) How many students are taking none of these courses? (b) How many students are taking exactly one of the courses? (C) How many students are taking exactly two of the courses?