Question
A class is given a list of eight study problems from which five will be part of an upcoming exam. If a given student knows how to solve six of these problems, find the probability that the student will be able to answer:
(a) all five questions on the exam.
(b) exactly eight questions on the exam.
(c) at least nine questions on the exam.
No matter what I try -- permutations, combinations, random multiplying and dividing -- I can't figure any of these parts out. I don't even know where to start, really.
(a) all five questions on the exam.
(b) exactly eight questions on the exam.
(c) at least nine questions on the exam.
No matter what I try -- permutations, combinations, random multiplying and dividing -- I can't figure any of these parts out. I don't even know where to start, really.