JEE Main & Advanced Mathematics Sets Question Bank Relations

  • question_answer
    The relation ?less than? in the set of natural numbers is                                    [UPSEAT 1994, 98, 99; AMU 1999]

    A) Only symmetric

    B) Only transitive

    C) Only reflexive

    D) Equivalence relation

    Correct Answer: B

    Solution :

    Since \[x<y,\,y<z\Rightarrow x<zx,\,y,\,z\in N\] \[\therefore \]\[x\,R\,y,\,yR\,z\Rightarrow x\,R\,z\] , \[\therefore \] Relation is transitive,  \[\therefore \]\[x<y\] does not give \[y<x\], \[\therefore \] Relation is not symmetric. Since \[x<x\] does not hold, hence relation is not reflexive.


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