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II, III, and IV (stufy island)
For addition, 0 and for multiplication, 1.
The answer depends on the context. There are opposite numbers that can be the additive inverses, or multiplicative inverses.
Please don't write "the following" if you don't provide a list. This is the situation for some common number sets:* Whole numbers / integers do NOT have this property. * Rational numbers DO have this property. * Real numbers DO have this property. * Complex numbers DO have this property. * The set of non-negative rational numbers, as well as the set of non-negative real numbers, DO have this property.
Integers