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What is a proper subset

Answer»

Proper SUBSET definition. A proper subset of a SET A is a subset of A that is not equal to A. In other words, if B is a proper subset of A, then all elements of B are in A but A CONTAINS at LEAST one ELEMENT that is not in B. For example, if A={1,3,5} then B={1,5} is a proper subset of A.

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