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The relation R in the set {a,b,c} given ...

The relation `R` in the set `{a,b,c}` given by `R={(a,a), (b,b), (a,b), (b,a)}` is a) symmetric and transitive, but not reflexive b) reflexive and symmetric, but not transitive c) symmetric, but neither reflexive nor transitive d) an equivalence relation

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