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What is the domain( the first element or number,from each pair)of this Relationship?{(4,-1),(5,2),(6,1),(8,5)}

User Calvintwr
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\bf \{(\stackrel{\downarrow }{4},-1),(\stackrel{\downarrow }{5},2),(\stackrel{\downarrow }{6},1),(\stackrel{\downarrow }{8},5)\}\impliedby domain
User Moorthy
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