If cardinality of (A U B) = cardinality of A+ cardinality of B. This means ____________(a) A is a subset of B(b) B is a subset of A(c) A and B are disjoint(d) None of the mentionedI had been asked this question in a job interview.This is a very interesting question from Cardinality of Sets topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

If cardinality of (A U B) = cardinality of A+ cardinality of B. This m

1.	If cardinality of (A U B) = cardinality of A+ cardinality of B. This means ____________(a) A is a subset of B(b) B is a subset of A(c) A and B are disjoint(d) None of the mentionedI had been asked this question in a job interview.This is a very interesting question from Cardinality of Sets topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics
Answer» RIGHT choice is (C) A and B are disjoint For explanation I would say: Thus if the CARDINALITY of (A U B) = cardinality of A+ cardinality of B, it means they don’t have any ELEMENT in common, n(A∩B) = 0.

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