Answer
$A\in B$
$C\subseteq D$
The symbol $\in$ indicates that $A$ is a single element of the set $B$.
The symbol $\subseteq$ indicates that all the elements of the set $C$ are also elements of the set $D$.
Work Step by Step
When we have:
$A\in B$
$C\subseteq D$
The symbol $\in$ indicates that $A$ is a single element of the set $B$.
The symbol $\subseteq$ indicates that all the elements of the set $C$ are also elements of the set $D$.
Therefore, $A\in B$ and $A\subseteq B$ are not interchangeable.
