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You can think of lots of sets that don't contain a number; or that contain it for that matter. In this case, the most natural such set is probably the set of natural numbers, {0, 1, 2, 3, ...}. Another example would be the set of even numbers: {0, 2, -2, 4, -4, 6, -6, ...}.

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Q: Which category dose not incluse the number -45?
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