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Mathematics 14 Online
OpenStudy (anonymous):

Among 50 students 22 took Finance, 19 took Marketing, 17 took Accounting. 12 took both Finance and Marketing, 9 took both Finance and Accounting, 5 took both Marketing and Accounting. 3 of them took all the three courses. How many students didn't take any courses?

OpenStudy (goformit100):

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