The image contains a mathematical problem written in Persian and includes set theory notation with three sets $A$, $B$, and $C$. The question appears to be asking for the number of elements in the set $A - C$, based on provided information about the sizes of the sets and their differences.

Let's break down the details:

1. The text describes the sets $A$, $B$, and $C$, and the set operations involving these sets, such as $(C - B)$, $(C - A)$, $(B - A)$, and $(A - B)$.
2. The cardinalities (sizes) of the sets involved in these operations are given as 3, 5, 2, 0, 4, and 1.

The problem is asking for the number of elements in the set $A - C$ based on the given information.

To solve this problem, we'd need to apply set theory operations and relationships, including the sizes of unions and intersections of sets. If you'd like a detailed explanation of how to approach this, or if you'd like me to clarify further steps, feel free to ask!

Do you want more details on how to solve this?

Here are 5 questions to expand on this problem:

1. How do the operations $A - B$ and $A - C$ differ in set theory?
2. What are the basic properties of set subtraction and intersection in set theory?
3. How can Venn diagrams help visualize the relationships between sets $A$, $B$, and $C$?
4. How do you calculate the cardinality of the union of multiple sets?
5. What is the significance of empty sets or sets with zero elements in such problems?

Tip: When solving problems involving multiple sets, always start by organizing the known cardinalities and relationships to simplify your solution.