Algebra Examples

$A = (1, 2, 3)$ , $B = (1, 2, 3, 8)$

Step 1

$A$ is a subset of $B$ and $A$ is not equal to $B$ , which is the definition of a proper subset..

$A = (1, 2, 3)$ is a proper subset of $B = (1, 2, 3, 8)$