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Kalenda · Answer 1 · 2017-07-03T11:55:32+0000

Hello,

Addition : no because -1+(-1)=-2 not in set.
Division : no because 1/0 is not in the set :infinity
Multiplication yes: {-1,0,1}*{-1,0,1}={-1,0,1}
Substraction: No because (-1)-(1)=-2 not in set.

Answer C

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