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OpenStudy (anonymous):
Mr. Green teaches band, choir, and math. This years, he has 57 students that take at least one of his classes. He teaches band to 25 students. There are 48 students who take either band or choir or both. There are 9 students who take both math and choir with Mr. Green. Use the Venn diagram. a. How many student take exactly 2 classes from Mr. Green?
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