10 belongs to the set "natural numbers", but it can also belong to whole numbers, and rational numbers
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The set of numbers which 3 does not belong is the set of even numbers.
48 doesn't belong! 1-2 (+3) 5-10 (+3) 13-26 (+3) 29-48 In each set the 1st number is half of the 2nd exept for the last set.
The set of even numbers
The union of sets X and Y is the set consisting of all elements that belong to X, or belong to Y or to both.The union of sets X and Y is the set consisting of all elements that belong to X, or belong to Y or to both.The union of sets X and Y is the set consisting of all elements that belong to X, or belong to Y or to both.The union of sets X and Y is the set consisting of all elements that belong to X, or belong to Y or to both.
A set is just a way of describing numbers, and numbers can be described in more than one way. If set A is (for example) all positive prime numbers, and set B is all numbers between 0 and 10, then there are some numbers (2, 3, 5, and 7) that could belong to both sets.