Definition of subset and empty set. Let A and S be sets. Then A is a subset of S, written AC S, if every element in A is also in S. The empty set is the set containing no elements and is denoted Ø. (a) List all subsets of two elements that may be identified within the set {a, b, c, d}, and say how many such subsets there are. (b) Is it true that 0C {a, c}

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