$\begin{array}{1 1} 3 \\ 2 \\ 1 \\0 \end{array} $

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- A relation R in a set A is called $\mathbf{ reflexive},$ if $(a,a) \in R\;$ for every $\; a\in\;A$
- A relation R in a set A is called $\mathbf{symmetric}$, if $(a_1,a_2) \in R\;\Rightarrow\; (a_2,a_1)\in R \; for \;a_1,a_2 \in A$
- A relation R in a set A is called $\mathbf{transitive},$ if $(a_1,a_2) \in R$ and $(a_2,a_3) \in R \; \Rightarrow \;(a_1,a_3)\in R$ for all$\; a_1,a_2,a_3 \in A$

Given Let $ A=\{a,b,c\}$

$R=\{(a,a),(b,c),(a,b)\}$

If we add (b,b) and (c,c) in R the relation R becomes reflexive

If we add (a,c) it becomes transitive

$ (a,b),(b,c) \in R =>(a,c) \in R$

Hence the minimum number of ordered pair to be added to R is (b,b),(c,c),(a,c) is 3

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