Professor Hickey assigned two homework problems to a class of 45 students. At the next meeting, 11 indicat worked the first problem, 15 had worked the second problem, and 7 had worked both. (a) Determine the number who worked at least one of the problems. X students (b) Determine the number who worked only the first problem. 4 students (c) Determine the number who worked exactly one of the problems. X students (d) Determine the number who worked neither of the problems. students

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