Is the collection of integers closed under addition ? Give a suitable example.
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The set of integers is closed under the operation of addition because the sum of any two integers is always another integer and is therefore in the set of integers. ... For example, 4 and 9 are both integers, but 4 ÷ 9 = 4/9. 4/9 is not an integer, so it is not in the set of integers!
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