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posted by Mike Monday, January 18, 2010 at 7:39pm.
If 10 is removed from the set of whole numbers, is the set closed with respect to addition? Explain why or why not.
Is the set closed under this operation? 5+5 = 10 (note that 5 ∈ℤ' and 10 ∉ℤ', where ℤ' is ℤ\10)
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