MathematicsMedium58×since 2004Q5382Let R1R_{1}R1 and R2R_{2}R2 be two relations defined on R\mathbb{R}R by a R1 b⇔ab≥0a \,R_{1} \,b \Leftrightarrow a b \geq 0aR1b⇔ab≥0 and a R2 b⇔a≥ba \,R_{2} \,b \Leftrightarrow a \geq baR2b⇔a≥b Then,AR1R_{1}R1 is an equivalence relation but not R2R_{2}R2BR2R_{2}R2 is an equivalence relation but not R1R_{1}R1Cboth R1R_{1}R1 and R2R_{2}R2 are equivalence relationsDneither R1R_{1}R1 nor R2R_{2}R2 is an equivalence relationCheck answerSkip