What is proper subset - Definition and Meaning

Proper Subset :

In set theory, a set is considered to be a proper subset, if the elements in the given set is not equal to the other set.

Example :

If A={1,2,3,4} then B={2,4}, so B is a proper subset of A. C={1,2,3,4} is a subset of A, but it is not a proper subset of A, as C=A

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