1.

For any two sets A and B, A⋂(A⋂B) = A. A B. B C. φ D. none of these

Answer»

Here correct answer is D. none of this as A⋂(A⋂B) = (A⋂A)⋂B) 

= A⋂B 

Or we have to give one condition that A⊂B then correct answer is A because A⋂(A⋂B) = (A⋂A)⋂B) 

= A⋂B 

= A (∵ A⊂B⇒A⋂B = A)



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