Let the universal set U = {x : x is the natural number less than 20}. If A = {0, 2, 7, 15, 19, 20} and B = {5, 7, 9, 11, 13, 17, 20}, then (A – B) ∩ U is?
1. Subset of U, A, but not of B
2. Subset of U but not of A or B
3. Subset of U, A and B
4. Subset of U, B, but not of A

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