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A group of 30 students are numbered 1-30, all even numbered students take statistics, all students who have a number which is evenly divided by

A group of 30 students are numbered 1-30, all even numbered students take statistics, all students who have a number which is evenly divided by three take computer science, and all of the students with numbers greater than 20 take data science. How many students attend at least one of the three courses

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