A = {x ≤ Z | x = 6a + 1 for some a € Z} B = {y = Z | y = C = {z EZ | z = 126 + 7 for some b = Z} 12c5 for some c € Z}. (a) Disprove that ACB. (HINT: write the definition of "not a subet of" by negating the subset defintion.) (b) Is BCA? Do not prove, but give reasons for your answer. (c) Use the "element chasing" method to prove that B = C;

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