Discussion
If n(A) = 30 and n(B) = 40, and the two sets are disjoint, what is n(A Δ B)?
Answer: D
The symmetric difference A Δ B = (A ∪ B) - (A ∩ B).
Since the sets are disjoint, n(A ∩ B) = 0.
For disjoint sets, n(A ∪ B) = n(A) + n(B) = 30 + 40 = 70.
Therefore, n(A Δ B) = n(A ∪ B) - 0 = 70.
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