Let $R$ be a relation defined on $\mathbb { N }$ as a $R$ b is $2 a + 3 b$ is a multiple of $5 , a , b \in \mathbb { N }$. Then $R$ is (1) not reflexive (2) transitive but not symmetric (3) symmetric but not transitive (4) an equivalence relation
Let $R$ be a relation defined on $\mathbb { N }$ as a $R$ b is $2 a + 3 b$ is a multiple of $5 , a , b \in \mathbb { N }$. Then $R$ is
(1) not reflexive
(2) transitive but not symmetric
(3) symmetric but not transitive
(4) an equivalence relation