By drawing a Venn diagram, simplify each of the expressions to involve at most one union and

Question:

By drawing a Venn diagram, simplify each of the expressions to involve at most one union and the complement symbol applied only to R, S, and T.
1. (T ∩ S) ∪ (T ∩ R) ∪ (R ∩ S') ∪ (T ∩ R' ∩ S')
2. (R ∩ S) ∪ (S ∩ T) ∪ (R ∩ S' ∩ T')
3. ((R ∩ S') ∪ (S ∩ T') ∪ (T ∩ R'))'
4. (R ∩ T) ∪ (R ∩ S) ∪ (S ∩ T') ∪ (R ∩ S' ∩ T')