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On (A={1,2,3,4,5,6}), (R={(a,b):\gcd(a,b)\text{ is even}}). How many diagonal pairs must be added to make it reflexive?

Answer and explanation

Correct answer: 3

Step 1: A total of (6) diagonal pairs are required. Step 2: ((2,2),(4,4),(6,6)) are already present because their greatest common divisor is even. Step 3: ((1,1),(3,3),(5,5)) must be added, so the answer is (3).

Related tags

Reflexive RelationGcdMinimum AdditionRelations And FunctionsMathematicsClass 12 Mcq

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