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

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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