(Solved): (iii) In the three-circle Venn diagram below, shade the portion corresponding to the set \( R \cap\ ...

(iii) In the three-circle Venn diagram below, shade the portion corresponding to the set \( R \cap\left(S^{\prime} \cup T\right) \) (iv) In the three-circle Venn diagram below, shade the portion corresponding to the set \( R^{\prime} \cap S \cap T^{\prime} \) 7. (3 points) (i) Use De Morgan's Laws to simplify the expression: \( T \cup(S \cap T)^{\prime} \). (ii) Use De Morgan's Laws to simplify the expression: \( S^{\prime} \cup(S \cap T)^{\prime} \). (3 points) A survey of 120 investors in stocks and bonds revealed that 90 investors owned stocks and 70 owned bonds. How many investors owned both stocks and bonds?