1.Given two setsAAandBB. Ifn(A)=n(A)=55,n(B)=n(B)=28 andn(AB)=n(AB)=13, thenn(AB)=n(AB)=

2.Last year the College of Peaceful Seas admitted 1,000 freshmen. All of them had to take the math and English placement exams. After the exams it was determined that 559 of the freshmen needed to take the math refresher course, 342 needed to take the English refresher course, but 254 of them didn't need to take either. How many freshmen needed to take both the math and the English refresher courses?

3.Mr. A once said:Success is 30% hard work and 93% hanging out with the right crowd.Mr. A believed these were the only two factors that contributed to his success. Suppose he was right, what percent of his success was due to simultaneously doinghard work and hanging out with the right crowd? Enter answer as a percent without the percent symbol. For example, if the answer is 5%, enter 5.

4.Dr. Rhonda gave a presentation at a conference. She asked the audience whether they had seen movies A, B, and C, and gathered the following numbers:

223 people had seen A, 219 had seen B, 229 had seen C, 114 had seen A and B, 121 had seen A and C, 116 had seen B and C, 42 had seen all three, and 21 had seen none of the three.

How many people attended her presentation?