1. Let the universal set U = {x | x is a non-negative integer}. Let A = {x ∈ U | x is divisible by 6}, B = {x ∈ U | x is divisible by 3} and C = {x ∈ U | x is divisible by 4}. By listing, determine A ∪ C. 2. Let the universal set U = {x | x is a non-negative integer}. Let A = {x ∈ U | x is divisible by 6}, B = {x ∈ U | x is divisible by 3} and C = {x ∈ U | x is divisible by 4}. By listing, determine B ∩ C. 3. Let U = (−∞,∞), A = [−1, 6], B = [−6, 2). In interval notation, determine A ∩ B. 4. Let U = (−∞,∞), A = [−1, 6], B = (−6, 2). In interval notation, determine A − B.

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