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math

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If 10 is removed from the set of whole numbers, is the set closed with respect to addition? Explain why or why not.

  • math -

    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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