Suppose I give you a list of 21 problems to study, from which I will randomly pick 12 questions for your first midterm exam.
For whatever reason, you prepare for the midterm exam by completing and understanding how to solve 11 questions of the 21, so there are 10 questions you do not know how to solve.
Part (a) What is the probability that you completely solve 8 of the 12 questions appearing on the midterm exam?
Part (b) To pass the midterm, you must correctly solve at least half of the 12 questions. What is the probability of you passing the midterm exam?
I'm a little confused on how to proceed, help would be greatly appreciated