Answer :

B. Φ = 0 is false, because Φ is a null set, it is not equal to any element.


C. Φ = {0} is false, because Φ should not contain any element in the set, but here it contains an element.


D. Φ = {Φ} is also false, because null set will be considered as an element in the set.


A. {x:x2 = -1, xZ} = Φ


For any value of x, x2 will not be going to -1. So, the set will be remained with no elements. So, this set will be considered as null set


option(A) is true.

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