Jessica​’s class schedule for next semester must consist of exactly one class from each of the four categories shown. All sections for the 22 most popular classes in are full. The rest of the courses

Jessica​’s class schedule for next semester must consist of exactly one class from each of the four categories shown. All sections for the 22 most popular classes in  are full. The rest of the courses are available. Determine the number of different sets of classes  can take.Category Number of Choices 

Economics3

Mathematics3

Education3

Sociology4

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