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On (A={1,2,3,4,5,6}), (R={(a,b):a\equiv b \pmod{3}}). How many total pairs will (R) have?

Answer and explanation

Correct answer: 12

Step 1: The equal-remainder groups modulo 3 are ({1,4}), ({2,5}), and ({3,6}). Step 2: Pairs are formed only within each group, so each group gives (2^2=4) pairs. Step 3: Total pairs are (4+4+4=12), and the relation is reflexive.

Related tags

Congruence ModuloPair CountReflexive RelationHardRelations And FunctionsMathematicsClass 12 Mcq

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