# Chapter P - Mid-Chapter Check Point - Page 71: 13

$\{a,c,d,e,f,h\}$

#### Work Step by Step

Recall the following: $x\in A\cup B$ if and only if $x\in A$ or $x\in B$. Thus, to find the union of the given sets, we must find all elements that appear in either set. This gives us: $$\{a,c,d,e\}\cup\{c,d,f,h\}=\{a,c,d,e,f,h\}$$

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