In how many ways can 7 instructors be assigned to seven sections of a course in mathematics?
How many different ways are there for an admissions officer to select a group of 7 college candidates from a group of 19 applicants for an interview?
A man has 8 pairs of pants, 5 shirts, and 3 ties. How many different outfits can he wear?
Two balls are to be selected without replacement from a bag containing one red, one blue, one green, one yellow, and one black ball. How many points are there in the sample space?