Question: A teacher grades in such a way that exactly 50% of the students earn either a B or higher grade. If a student drawn at

A teacher grades in such a way that exactly 50% of the students earn either a B or higher grade. If a student drawn at random takes four unrelated courses with this teacher, what is the probability that the student will earn

a. All four grades of B or higher,

b. Exactly three grades of B or higher, and

c. Two or more grades of B or higher?

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