Let $A=\{2,5,6,13,15\}$ and $E=\{6\}$. Insert $\subseteq$ or $\nsubseteq$ to make the statement true.

Insert $\subseteq$ or $\nsubseteq$ to make the statement true.
$\mathrm{A} \nabla \mathrm{E}$

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Answer

$\boxed{A \nsubseteq E}$ is the final answer.

Steps

Step 1 ：Let $A=\{2,5,6,13,15\}$ and $E=\{6\}$. We are asked to insert $\subseteq$ or $\nsubseteq$ to make the statement true.

Step 2 ：The question is asking whether set A is a subset of set E or not. A subset is a set whose elements are all members of another set.

Step 3 ：In this case, set A is $\{2,5,6,13,15\}$ and set E is $\{6\}$. We can see that not all elements of set A are in set E.

Step 4 ：Therefore, A is not a subset of E. We should use the symbol $\nsubseteq$ to make the statement true.

Step 5 ：$\boxed{A \nsubseteq E}$ is the final answer.