Write the set that the shaded part of the Venn Diagram represents.

Write the set that the shaded part of the given diagram represents.

The set that the shaded part of each Venn Diagram represents is $A\cap B\cap C$. Find $X$

The set that the shaded part of the Venn Diagram represents is $(A\cup B\cup C)\cap (a^{\text{'}}\cup B)$. Find $a$.

Write the set that the shaded part of each Venn Diagram represents.

1: $(B\cup C)-(A\cup B\cup C)$

2: $(B\cap C)-(A\cap B\cap C)$

Write $1$ or $2$ as the final answer.

The set that the shaded part of each Venn Diagram represents is $a^{\text{'}}\cup (A\cup C)$ . Find $a$

The set that the shaded part of each Venn Diagram represents is $B^{\text{'}}\cup {(A\cup a)}^{\text{'}}$. Find $a$.

For the Venn Diagram, describe the characteristics of only whales, of only fish, and those of both whales and fish. 

Explain how the diagram has helped with your descriptions and whether a different form could be more useful.