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About Senior High School Mathematics Elective Course 2-3
The distribution method of five people is: 1, 1, 3; 1,2,2

So (group first, then enter the site)

1, 1,3; Methods: C (5,3) A (3)A(3) = 60.

1,2,2; Methods: [c (5,2) c (3,2)/a (2,2)] a (3,3) = 90.

So there are 150 kinds of * *.