Find the Cardinal Number of the Set $\text { } \begin{aligned}& n ( U ) = 60 \\& n ( A ) = 35 \\& n ( B ) = 20 \\\end{aligned}$

question 204

Multiple Choice

Find the cardinal number of the set.
- Given:
$\text { } \begin{aligned}& n ( U ) = 60 \\& n ( A ) = 35 \\& n ( B ) = 20 \\\end{aligned}$
$n ( A \cap B )$ =4
Find $n ( A \cup B ) ^ { \prime }$ .

• A) 51
• B) 55
• C) 9
• D) 5