Intersection

$x$ $x$ $x$ $x$ $x$ $x$ $x$ $x$ $x$

Consider the following two events $A$ and $B$ :

$\begin{array}{rcl} A &=& \{1,\,4,\,14,\,15,\,20,\,21\}\\ B &=&\{1,\,2,\,3,\,8,\,15,\,20\} \end{array}$

What is the intersection of $A$ and $B$ ? Note: Enter the elements in order from smallest to largest.

$A \,\cap\, B = \{$

,

,

$\}$

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