Q. 54.8( 4 Votes )

Let R be the relation over the set of all straight lines in a plane such that ℓ1 R ℓ2 1 2. Then, R is
A. symmetric

B. reflexive

C. transitive

D. an equivalence relation

Answer :

Think of line as a vector quantity:

As 1 2;


And ℓ2 1


Hence R is symmetric.


Also Given a relation R over straight lines such that 1 2


As ℓ1 2:


1. ℓ2=0(DOT PRODUCT)


cos θ =0 as θ =90°;


This thing is possible if 1 and ℓ2 are symmetric.


E.g. A= 2i-4j and B=-4i-2j


A. B=-8+8=0

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Functions - 01Functions - 01Functions - 0152 mins
Range of FunctionsRange of FunctionsRange of Functions58 mins
Quick Revision of Types of RelationsQuick Revision of Types of RelationsQuick Revision of Types of Relations59 mins
Some standard real functionsSome standard real functionsSome standard real functions61 mins
Battle of Graphs | various functions & their GraphsBattle of Graphs | various functions & their GraphsBattle of Graphs | various functions & their Graphs48 mins
Functions - 09Functions - 09Functions - 0947 mins
Quick Recap lecture of important graphs & functionsQuick Recap lecture of important graphs & functionsQuick Recap lecture of important graphs & functions58 mins
Range of Quadratic/quadratic & linear/Linear functionsRange of Quadratic/quadratic & linear/Linear functionsRange of Quadratic/quadratic & linear/Linear functions45 mins
Understand Fractional part and Mod Function in 1 hourUnderstand Fractional part and Mod Function in 1 hourUnderstand Fractional part and Mod Function in 1 hour61 mins
Functions - 06Functions - 06Functions - 0648 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses