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PS:Ans is (C), Explain why statement-4 is TRUE?

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in option (4)-

take 1st time ,L=ab

        2nd time,L=ba.

and rest all (i.e. 103 times) take L=null.
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1) That is always true.

2) Cardinality of it would be 1 as it contains NULL.

4) someone answered it correctly.

3) for this read this,you would get it all.

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