Discussion
If A and B are disjoint sets, then n(A ∩ B) is:
Answer: A
Disjoint sets share no elements at all, so their intersection is empty.
\[ n(A \cap B) = 0 \]
This is why \( n(A \cup B) = n(A) + n(B) \) for disjoint sets, with no correction term.
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