Find the Cardinal Number of the Indicated Set $\mathrm { n } ( \mathrm { A } ) = 7 , \mathrm { n } ( \mathrm { B } ) = 15$

question 236

Multiple Choice

Find the cardinal number of the indicated set. Use the cardinal number formula.
-If $\mathrm { n } ( \mathrm { A } ) = 7 , \mathrm { n } ( \mathrm { B } ) = 15$ and $\mathrm { n } ( \mathrm { A } \cap \mathrm { B } ) = 5$ , what is $\mathrm { n } ( \mathrm { A } \cup \mathrm { B } )$ ?

• A) 16
• B) 18
• C) 22
• D) 17

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