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Answer

actually number of elements in the union of two sets A and B = number of elements in A + number of elements in B - number of common elements in both A and B.

so none of the answer given is true.

hence answer will be option 4) none of these

Answer
4. None of them. This is because it is the set having all the elements of set A and set B without repetition. Therefore the Cardinal no. of union set might or might not match with the sum of the Cardinal nos. if set A and set B.
Answer
4th option is correct
Answer
1. It gives us information about the number of elements in set A as well as the number of elements in set B. Reason- Only the cardinal numbers of the two sets are taken into consideration
Answer
4. None of them. This is because it is the set having all the elements of set A and set B without repetition. Therefore the Cardinal no. of union set might or might not match with the sum of the Cardinal nos. if set A and set B.
Answer
3. Union of two sets is just total number of elements in both sets counted only once.We disregard repeating elements.
Answer
4. None of these ; It gives us information about the number of elements in set A plus the number of elements present in set B minus the number of elements present in A as well as B

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