What is the domain and range of the function f that assigns to each pair of negative integers x and y, the value x + y.

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Let $\Z^{-}$ is the set of all negative integers $(..., -3, -2, -1).$ Then

Domain: $\Z^-\times\Z^-$

Range: $\Z^{-}\backslash \{-1\}$

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Question ID: mtid-5-stid-8-sqid-972-qpid-827