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Question

Let a relation R on the set N of natural numbers be defined as (x,y)x24xy+3y2=0 x,yN. Then the relation R is

A
reflexive
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B
symmetric
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C
transitive
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D
an equivalence relation
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Solution

The correct option is A reflexive
Given (x,y)x24xy+3y2=0
or (x,y)(xy)(x3y)=0
or (x,y)x=y or x=3y

(1) Reflexive :
Clearly, (x,x)R for all xN as x=y
R is reflexive.

(2) Symmetric :
(3,1)R but (1,3)R
R is not symmetric.

(2) Transitive :
(9,3),(3,1)R but (9,1)R
So, R is not transitive.

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