How many combinations of flavors may be chosen among the four of them if each one selects one flavor?

Question

Two girls and their dates go to the drive-in, and each wants a different flavored ice cream cone. The drive-in has 24 flavors of ice cream. How many combinations of flavors may be chosen among the four of them if each one selects one flavor?

Answer 1

The two girls can not select the same flavor. I'm assuming that each cone contains one scoop of ice cream. The first girl can choose any one of the 24 flavors. The second girl can choose any one of the remaining 23 flavors. Therefore, the two girls together can choose 24*23 = 552 combinations of flavors.