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A teacher gives her students 15 Math problems, and tells the students that the upcoming exam will consist of 6 out of the 15 problems,

A teacher gives her students 15 Math problems, and tells the students that the upcoming exam will consist of 6 out of the 15 problems, chosen at random. Suppose that a student knows how to solve 11 out of the 15 problems. What is the probability that the student will know how to solve at least 5 of the 6 problems on the exam?

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