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If (R={(x,y):x-y>0}) is defined on real numbers, why is (R) not symmetric?

Answer and explanation

Correct answer: Because (2-1>0), but (1-2>0) is not true

Step 1: One counterexample is enough to disprove symmetry. Step 2: ((2,1)\in R) because (2-1>0), but ((1,2)\notin R) because (1-2<0). Step 3: In inequality relations, reversing the order may change the sign.

Related tags

Real NumbersInequality RelationNon SymmetricCounterexampleSymmetric RelationRelations And FunctionsMathematicsClass 12 Mcq

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