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18 students can choose from snack, staple food, vegetables or none for lunch. Each student can choose whatever types of food as they want. Among 12 students who choose vegetables, 3 also choose snack but not staple food, 2 also choose staple food but not snack, while 4 also choose snack and staple food. What's the ratio of students who only choose vegetables to all students?
Give your answer as a fraction.
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以上解析由 考满分老师提供。
