in Set Theory & Algebra edited by
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can someone help me with example how A can be answer?? 

in Set Theory & Algebra edited by
by
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1 Answer

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If we take A={1,2} and B= {1,2}

A U B={1,2} and A intersection B ={1,2}

then A U B is a subset of A intersection B condition is satisfied.

now if A=B then cardinality of A will be always equal to cardinality of B.

thus option a is incorrect as it is mentioned  "always".

4 Comments

welcome..
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@Arnabi You took an example and proved A is wrong which is perfect. But an example is not enough to prove B is correct though what you meant is correct.
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@Arjun Sir can i say this as formal proof or should we take cases where A intersection B is phi 

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