Find the Cardinal Number of the Indicated Set $n ( A ) = 20 , n ( A \cup B ) = 58$

question 202

Multiple Choice

Find the cardinal number of the indicated set. Use the cardinal number formula.
-If $n ( A ) = 20 , n ( A \cup B ) = 58$ , and $n ( A \cap B ) = 16$ , find $n ( B )$ .

• A) 53
• B) 38
• C) 55
• D) 54