If A is a subset of B and B is a subset of C, then the cardinality of A ∪ B ∪ C is equal to:
\(A \subseteq B \subseteq C\), so \(A \cup B \cup C = C\).
So the cardinality of the union equals the cardinality of C.
Answer: (A)
Reinforce your conceptual grasp with related questions from MAH MCA CET 2020:
If \( 15\\ 8 + 15\\ 7 = n\\ r \)
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