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Determine if A is a Proper Subset of B

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

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

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$