3. Probability: Relationship between Events
Intersection
Consider the following two events #A# and #B#:
\[\begin{array}{rcl}
A &=& \{1,\,3,\,15,\,17,\,18,\,21\}\\
B &=&\{3,\,12,\,15,\,16,\,20,\,21\}
\end{array}\]
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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