The statement in the image reads:

"If $A \subseteq B$, then $n(A) \leq n(B)$."

This statement is true. Here’s why:

1. Subset Definition: If $A$ is a subset of $B$ ($A \subseteq B$), every element of $A$ is also an element of $B$.
2. Cardinality: The notation $n(A)$ represents the cardinality (or number of elements) of set $A$.
3. Implication: Since $A$ is a subset of $B$, the number of elements in $A$ cannot exceed the number of elements in $B$. This means that $n(A) \leq n(B)$.

Therefore, the statement is true.

Would you like further details or have any questions?

Here are some related questions to expand your understanding:

1. What is the definition of a proper subset?
2. How does the cardinality of the union of two sets $A$ and $B$ relate to the cardinalities of $A$ and $B$?
3. What happens to the cardinality relationship if $A$ is a proper subset of $B$ ($A \subset B$)?
4. Can you provide an example where $A \subseteq B$ and illustrate $n(A) \leq n(B)$ with specific numbers?
5. How does the inclusion-exclusion principle apply to the cardinalities of sets?

Tip: When dealing with set operations and cardinality, visualizing with Venn diagrams can often help clarify relationships and make understanding easier.