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If (A={1,2,3,4,5}) and (R={(a,b):a^2\equiv b^2 \pmod{3}}), why is (R) reflexive?

Answer and explanation

Correct answer: Because (a^2\equiv a^2 \pmod{3}) for every (a)

Step 1: For reflexivity, substitute ((a,a)) into the condition. Step 2: This gives (a^2\equiv a^2 \pmod{3}), which is always true by equality. Step 3: Even in power and modulo relations, test the same element first.

Related tags

Reflexive RelationModuloSquaresRelations And FunctionsMathematicsClass 12 Mcq

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