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If (A={1,2,3,4,5,6,7}) and (R={(a,b):a\equiv 3b \pmod{4}}), how many pairs must be added to make (R) reflexive?

Answer and explanation

Correct answer: 4

Step 1: On the diagonal, put (b=a), giving (a\equiv3a \pmod{4}). Step 2: This gives (2a\equiv0 \pmod{4}), so (a) must be even. In (A), (2,4,6) work. Step 3: Since (7) diagonal pairs are needed and (3) are present, (4) must be added.

Related tags

Reflexive RelationModuloMinimum AdditionRelations And FunctionsMathematicsClass 12 Mcq

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