1.Relation and Function
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ગણ $\{1,2,3,4,5,6\}$ પર વ્યાખ્યાયિત સંબંધ $R =\{(a, b): b=a+1\}$ એ સ્વવાચક, સંમિત કે પરંપરિત સંબંધ છે કે નહિ તે ચકાસો.

Option A
Option B
Option C
Option D

Solution

Let $A =\{1,2,3,4,5,6\}$.

A relation $R$ is defined on set $A$ as: $R=\{(a, b): b=a+1\}$

$\therefore R =\{(1,2),(2,3),(3,4),(4,5),(5,6)\}$

we can find $(a, a) \notin R,$ where $a \in A$

For instance,

$(1,1),\,(2,2),\,(3,3),\,(4,4),\,(0,5),\,(0,6) \notin R$

$\therefore R$ is not reflexive.

It can be observed that $(1,2) \in R ,$ but $(2,1)\notin R$

$\therefore R$ is not symmetric.

Now, $(1,2),\,(2,3) \in R$

But, $(1,3)\notin R$

$\therefore R$ is not transitive

Hence, $R$ is neither reflexive, nor symmetric, nor transitive.

Standard 12
Mathematics

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