The answers to exercises marked [BB] can he found in the Back of the Book.
Let n > 3 and A = {1, 2, 3,‖, n;}.
(a) [BBJ How many subsets of A contain {1, 2}?
(b) How many subsets B of A have the property that B ∩{l,2} = 0?
(c) How many subsets B of A have the property that B∪{1,2} = A?
Explain your answers.
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