se an element argument to prove the following statement. Assume that all sets are subsets of a universal set U. For all sets A and B, if A ⊆ B then  Bc ⊆ Ac. Some of the sentences in the following scrambled list can be used to write a proof. Suppose A and B are sets and A ⊆ B. Let x ∈ B. Hence, x ∉ A, because of the definition of subset and that A ⊆ B. Therefore, by definition of complement x ∈ Ac, and thus, by definition of subset, Bc ⊆ Ac. Suppose A and B are sets and A ⊆ B. Let x ∈ Bc. Hence, x ∉ A, because A ∩ B = ∅. By definition of complement, x ∉ B. Proof: We construct a proof by selecting appropriate sentences from the list and putting them in the correct order.

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