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Let A={1,2,3,4,5,6,7}. Then the relation...

Let `A={1,2,3,4,5,6,7}`. Then the relation `R={(x,y) in A xx A : x+y=7}` is

A

reflexive but neither symmetric nor transitive

B

an equivalence relation

C

symmetric but neither reflexive nor transitive

D

transitive but neither symmetric nor reflexive

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