Let $\mathrm{A}=\{-3,-2,-1,0,1,2,3\}$ and R be a relation on $A$ defined by $x R y$ if and only if $2 x-y…

Let $\mathrm{A}=\{-3,-2,-1,0,1,2,3\}$ and R be a relation on $A$ defined by $x R y$ if and only if $2 x-y \in\{0,1\}$. Let $l$ be the number of elements in R. Let $m$ and $n$ be the minimum number of elements required to be added in R to make it reflexive and symmetric relations, respectively. Then $l+\mathrm{m} \mathrm{n}$ is equal to :-
  1. $18$
  2. $17$
  3. $15$
  4. $16$

Solution

$\begin{aligned} & \begin{array}{l}2 \mathrm{x}-\mathrm{y}=0 \\ \{0,0\}\{-1,-2\}\{1,2\} \\ 2 \mathrm{x}-\mathrm{y}=1\end{array} \\ & \{0,-1\}\{1,1\}\{2,3\}\{-1,-3\} \\ & \text { Total }(0,0)(-1,-2),(1,2)(0,-1),(1,1)(2,3)(-1,-3) \\ & \text { Reflexive } \quad \mathrm{m}=5 \quad \& \ell=7 \\ & \text { Symm. } \quad \mathrm{n}=5 \quad \ell+\mathrm{m}+\mathrm{n}=17 \\ & \text { option (2) }\end{aligned}$ .

Asked in: JEE Main 2025 (04 Apr Shift 2)

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