Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9}, A = {x: x is

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Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9}, A = {x: x is even and x ≥  5}, and B = {1, 2, 5, 7, 8, 9}. Complete the following.

(a) Find A c B9.

(b) Find a two-element set that is disjoint from B.

(c) Find a nonempty subset of A that is not equal to A.

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