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A class is given a list of 20 study problems from which 10 will be part of an upcoming exam.

A class is given a list of 20 study problems from which 10 will be part of an upcoming exam.  If a given student knows how to solve 15 of the problems, find the probablility that the student will be able to answer,
a. All 10 questions on the exam
b. Exactly 8 questions on the exam
c. At least 9 questions on the exam

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