3. Probability: Relationship between Events
Difference
Consider the following two events #A# and #B#:
\[\begin{array}{rcl}
A &=& \{1,\,3,\,7,\,8,\,11,\,21\}\\
B &=&\{3,\,9,\,11,\,17,\,18,\,21\}
\end{array}\]
What is the difference of #A# and #B#?
Note: Enter the elements in order from smallest to largest.
#A \,\backslash\, B = \{#, , #\}#
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