3. Probability: Relationship between Events
Union
Consider the following two events #A# and #B#:
\[\begin{array}{rcl}
A &=& \{4,\,7,\,15\}\\
B &=&\{9,\,13,\,15\}
\end{array}\]
What is the union of #A# and #B#?
Note: Enter the elements in order from smallest to largest.
#A \,\cup\, B = \{#, ,, , #\}#
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