At a college, 66 % of courses have final exams and 56 % of courses require research papers. Suppose that 45 % of courses have a research paper and a...

At a college, 66 % of courses have final exams and 56 % of courses require research papers. Suppose that 45 % of courses have a research paper and a final exam. 

Find the probability that a course has NONE of these two requirements.