For which operations is the set {–1, 1} closed? Choose all answers that are correct. A. addition B. subtraction C. multiplication D. division

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For which operations is the set {–1, 1} closed? Choose all answers that are correct. A. addition B. subtraction C. multiplication D. division

Mathematics
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If I remember what these questions are about, C, and D are correct. \[-1 \times 1 = -1 \] \[\dfrac{-1}{1} = -1\] Negative one is part of the set. Ergo, closed.
so times and subtraction?
Subtraction does not work, since you get 0, and that is not part of the set.

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Other answers:

okay so its a c or d we know its c what about addition?
Actually we know it is both, C, and D. Any my bad, with addition we get zero, subtraction gives us -2, which is also not in the set.
okay so its just c d?
Addition: -1 + 1 = 0. Subtraction: -1 - 1 = -2
Yes.
so b c d?
B gives -2, and the set is only {-1, 1} so no.
okay M<# thans

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