## Thinking Mathematically (6th Edition)

$A\subseteq B$ $A\subset B$
Written using the roster method, the sets are equal to: $A=\{6, 7, 8, 9, 10, 11\}$ $B=\{4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16\}$ We can see that. $A\subseteq B$ is true, as every element in set $A$ is also an element in set $B$, $A\subset B$ is true, as $A\subseteq B$ and A and B are not equal.