Write the power set of the set {a, b, c, d}. Which of them are proper supersets of the set {a, c}.
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Proper subset definition. ... 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. The set C={1,3,5} is a subset of A, but it is not a proper subset of A since C=A.
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