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  4. If A and B are two non-empty subsets of a set X such that A is not a subset of B. Then,

Q. If and are two non-empty subsets of a set such that is not a subset of . Then,

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Solution:

Since, therefore it is not necessary that is subset of .

And also, it is not necessary that and are disjoint. Obviously, and are not disjoint.

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