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On A={1,2,3,4}, R={(a,b): |a-b|=1}. What type is R?

Answer and explanation

Correct answer: Symmetric

The governing test for symmetry is: whenever (a,b) belongs to R, the reversed pair (b,a) must also belong to R. If |a-b|=1, then |b-a|=|-(a-b)|=|a-b|=1. Thus every pair satisfying the condition has its reverse satisfying the same condition. For example, (1,2) and (2,1), or (3,4) and (4,3), occur together. Therefore R is symmetric. It is not reflexive because |a-a|=0, and it is not universal because many pairs have distance other than 1.

Related tags

Absolute Value RelationSymmetric RelationRelation Properties

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