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Su Jiaoban Senior High School Mathematics Elective Course 2-3
The title says that each project should get at least one project, which means that only one of the three teams has got two projects, so we have to choose one team from the three teams, that is, the combination number C 1.3 * C24 (two out of four projects) *A 2 2 (after the two projects are divided, there are two projects and two engineering teams, all of which are arranged.