## Intermediate Algebra (12th Edition)

$A\cap B= \{ a,c \}$
$\bf{\text{Solution Outline:}}$ To get the elements of $A\cap B ,$ get all the common elements of $A$ and $B$. $\bf{\text{Solution Details:}}$ The intersection of $A$ and $B,$ given by $A\cap B$, are all the common elements of $A$ and $B$. With $A=\{ a,b,c,d \}$ and $B=\{ a,c,e,f \}$ then \begin{array}{l}\require{cancel} A\cap B= \{ a,c \} .\end{array}