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$\renewcommand{\bar}{\overline}\newcommand{\card}[1]{\left| #1 \right|}$

Suppose you have sets $A$ and $B$ with $\card{A} = 10$ and $\card{B} = 15\text{.}$

What are the possible values for $\card{A \cup B}\text{?}$

$\le \card{A \cup B} \le$