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OpenStudy (anonymous):
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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OpenStudy (zzr0ck3r):
-1+1 = 0 is not in the ser -1-1 = -2 is not in the ser 1*1=-1*-1=1 is in the set -1*1=1*-1=-1 is in the set similarly for division
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