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Let (A={1,2,3,4,5,6,7,8}) and (R={(a,b)\in A\times A:a+b\text{ is divisible by }6}). What is the minimum number of pairs needed to make (R) reflexive?

Answer and explanation

Correct answer: 6

Step 1: A reflexive relation needs every ((a,a)). Step 2: On the diagonal, (a+b=2a), which is divisible by (6) only when (a) is divisible by (3). In (A), only (3) and (6) work. Step 3: (8) diagonal pairs are needed and (2) are present, so (6) must be added.

Related tags

Reflexive RelationDivisibilityDiagonal PairsExpertRelations And FunctionsMathematicsClass 12 Mcq

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