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

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Question:If cardinality of (A U B) = cardinality of A+ cardinality of B. This means ____________

1.A is a subset of B

2.B is a subset of A

3.A and B are disjoint

4.None of the mentioned

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  1. If cardinality of (A U B) = cardinality of A+ cardinality of B. This means ____________
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