Test whether the following relations ...

Test whether the following relations `R_1,R_2"and"R_3,""` are (i) reflexive (ii) symmetric and (iii) transitive: `R_1` on `Q_0` defined by `(a , b)R_1 a=1/b` `R_2` on `Z` defined by `(a , b)R_2|a-b|lt=5` `R_3` on `R` defined by `(a , b)R_3 a^2-4a b+3b^2=0`

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