Question

If 3 is removed from the whole numbers, is the collection of whole numbers closed
under addition?​

Answer 1

Answer:

No.

Step-by-step explanation:

The set of whole numbers with 3 removed looks like {0, 1, 2, 4, 5, 6, 7,...} ... This set is not closed under addition since 1 + 2 = 3 and 3 is not in the set.

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