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Mathematics is an elective course in senior high school.
a+b+c+d = 16; a & gt= 1,b >; =2,c & gt=3,d & gt=4

A' = A, B' = B- 1, C' = C-2, D' = D-3, then, a', b', c', d', all > = 1

a'+b'+c'+d'= 10

At this time, the partition method is used, and C9(3)=84.

This method can be used for this kind of quota allocation problem in the future. The requirement is that each class is greater than or equal to 1