The answers to exercises marked [BB] can be found in the Back of the Book.
Let A = {1, 2, 3,4). List all the subsets B of A such that
(a) [BB] {1,2} ⊆ B;
(b) B ⊆ {1,2};
(c) {1, 2} ⊈ B;
(d) B ⊈ {1,2};
(e)
(f)
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