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If A is a subset of B and B is a subset of C, then cardinality of A U B U C is equal to ____________

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If A is a subset of B and B is a subset of C, then cardinality of A U B U C is equal to ____________

(a) Cardinality of C

(b) Cardinality of B

(c) Cardinality of A

(d) None of the mentioned

The question was asked in an international level competition.

The question is from Cardinality of Sets topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Correct choice is (a) Cardinality of C

To explain: A U B U C = C, since a, b are subsets to C.

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