Step-by-step explanation:
Total number of chemistry students = 20
Number of students assigned to Adams Hall lab = 6
Number of students assigned to Baker Hall lab = 11
Number of Students assigned to Craig Hall Lab = 20 - (6+11) = 3
Number of possible assignments = [tex]\frac{20 !}{6! . 11!. 3!} = 14108640 assignments[/tex]
So there will be 14108640 possible assignements of students to Labs.