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Home  >>  CBSE XII  >>  Math  >>  Relations and Functions
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True or False: Let R={(3,1),(1,3),(3,3)} be a relation defined on the set A={1,2,3}.Then R is symmetric,transitive but not reflexive.

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  • 1. A relation R defined on A is reflexive if $(a,a) \in R \qquad a \in A$
  • 2. A relation R is symmetric if $(a,b) \in R=>(b,a) \in R \qquad a,b \in A$
  • 3. A relation R is transitive if $(a,b) \in R,(b,c) \in R =>(a,c) \in R \qquad a,b,c \in A$
$R=\{(3,1),(1,3),(3,3)\} \qquad A=\{1,2,3\}$
 
$(1,1)(2,2) \in R$
 
Therefore R is not reflexive
 
$(3,1) \in R => (1,3) \in R$
 
R is symmetric
 
$(3,1) \in R$ but there does not exists
 
$(1,2) or (1,4) \in R$
 
So R is not transitive
 
Hence R is symmetric but neither transitive nor reflexive
 
$'False'$

 

 

answered Mar 6, 2013 by meena.p
 

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