If $A$ and $B$ are disjoint, then $n(A \cup B)$ is equal to
If $A$ and $B$ are disjoint, then $n(A \cup B)$ is equal to
- A
$n(A)$
- B
$n(B)$
- C
$n(A) + n(B)$
- D
$n(A)\,.\,n(B)$
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