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On (A={1,2,3,4}), (R={(a,b):a-b\text{ is positive}}). Why is (R) not symmetric?

Answer and explanation

Correct answer: ((2,1)\in R) but ((1,2)\notin R)

Step 1: For ((2,1)), (2-1=1), so it belongs to the relation. Step 2: For the reverse pair ((1,2)), (1-2=-1), which is not positive. Step 3: One counterexample is enough to prove that a relation is not symmetric.

Related tags

CounterexampleSymmetric RelationOrdered PairsRelations And FunctionsMathematicsClass 12 Mcq

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