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

Answer and explanation

Correct answer: 3

Step 1: Reflexivity requires every ((a,a)). Step 2: On the diagonal, (a+b=2a), which is divisible by (4) only when (a) is even, so ((2,2),(4,4),(6,6)) are already present. Step 3: The missing diagonal pairs are ((1,1),(3,3),(5,5)), so (3) pairs are needed.

Related tags

Reflexive RelationDivisibilityDiagonal PairsClass 12Relations And FunctionsMathematicsClass 12 Mcq

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