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Let S be the universal set, where:
$S = \{1, 2, 3, \dots, 18, 19, 20\}$
Let sets A and B be subsets of S, where:
Set $A = \{1, 3, 4, 6, 7, 8, 13, 15, 18\}$
Set $B = \{4, 7, 8, 9, 13, 19, 20\}$
Set $C = \{1, 2, 3, 5, 7, 9, 12, 15, 16, 19\}$
Find the number of elements in the set
$(A \cap C) \cap B$
$n((A \cap C) \cap B) =$
You may want to draw a Venn Diagram to
help answer this question.
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