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Mathematics 11 Online
OpenStudy (anonymous):

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

OpenStudy (igreen):

I don't understand what it's asking.

OpenStudy (igreen):

The set {-1, 1}..what's that mean?

OpenStudy (anonymous):

idk thanks what i'm lost about to...

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