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Thirty students have enrolled either in finance or marketing or both. If 18 enrolled in finance and 17 enrolled in marketing , how many enrolled in both?

Thirty students have enrolled either in finance or marketing or both. If 18 enrolled in finance and 17 enrolled in marketing , how many enrolled in both? Correct Answer 5

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70 students are enrolled in Management, Accounting and Marketing. 40 students are in Management, 35 are in Accounting, and 30 are in Marketing. 15 students are enrolled in all three courses. How many of the students are enrolled in exactly two of the courses?
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