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On real numbers, (aRb) iff (a-b\in\mathbb{Z}) and (a+b\in\mathbb{Z}). What type of relation is it?

Answer and explanation

Correct answer: symmetric only

Step 1: If (aRb), then (b-a) and (b+a) are also integers, so it is symmetric. Step 2: Reflexivity would require (2a\in\mathbb{Z}) for every real (a), which is false. Step 3: The condition is not reflexive on all real numbers, so it cannot be an equivalence relation.

Related tags

RelationsReal-NumbersSymmetricInteger-ConditionIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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