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On (A={1,2,3,4}), (R={(a,b):a^2-b\text{ is even}}). What is the reflexivity status of (R)?

Answer and explanation

Correct answer: It is reflexive

Step 1: On the diagonal, put (b=a), giving (a^2-a=a(a-1)). Step 2: The product of two consecutive integers is always even. Step 3: Therefore every ((a,a)) belongs to the relation, so it is reflexive.

Related tags

Reflexive RelationParityQuadratic ExpressionRelations And FunctionsMathematicsClass 12 Mcq

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