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Let A and B be two non-empty subsets of a set X such that A is not a subset of B, then 

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By Expert Faculty of Sri Chaitanya
a
A is always a subset of the complement of B
b
B is always a subset of A
c
A and B are always disjoint
d
A and the complement of B are always non-disjoint
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detailed solution

Correct option is D

∴A is not a subset of B   ∴ Some point of A will not be a point of B, So that point will being to complement of B  . Hence A and complement of B are always non-disjoint


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