5. Let \( S \) be the set of all straight lines in a plane. Let \( R \) be a relation on defined by \( a R b \Leftrightarrow a \| b \). Then, \( R \) is(a) reflexive and symmetric but not transitive(b) reflexive and transitive but not symmetric(c) symmetric and transitive but not reflexive(d) an equivalence relation

5. Let \( S \) be the set of all straight lines in a plane. Let \( R \

1.	5. Let \( S \) be the set of all straight lines in a plane. Let \( R \) be a relation on defined by \( a R b \Leftrightarrow a \\| b \). Then, \( R \) is(a) reflexive and symmetric but not transitive(b) reflexive and transitive but not symmetric(c) symmetric and transitive but not reflexive(d) an equivalence relation
Answer» c ) Symmetric & transitive but not reflexive as if the line is a//a then it becomes concurrent

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