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The number of sets X ,such that X is proper subset of A and X is not a proper subset of B, where A= {a,b, c,d, e} and B= {c,d}?

Answer» The number of sets X ,such that X is proper subset of A and X is not a proper subset of B, where A= {a,b, c,d, e} and B= {c,d}?


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