8.b) 5 teachers (T₁ to T₅) are to be assigned to 5 classes (C₁ to C₅). Restrictions:
- T₁, T₂ not for C₁ or C₂
- T₃, T₄ not for C₄ or C₅
- T₅ not for C₃, C₄, or C₅
Find the number of valid assignments.
Answer:-
5 teachers (T₁ to T₅) are to be assigned to 5 classes (C₁ to C₅)