Find the Cardinal Number of the Indicated Set $n ( A ) = 8 , n ( B ) = 21$

question 250

Multiple Choice

Find the cardinal number of the indicated set. Use the cardinal number formula.
-If $n ( A ) = 8 , n ( B ) = 21$ and $n ( A \cup B ) = 25$ , what is $n ( A \cap B )$ ?

• A) 4
• B) 12
• C) 6
• D) 2

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