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This lesson takes up more examples on relations for class 12 board exams

## Vineet Loomba is teaching live on Unacademy Plus

Vineet Loomba
💥IITian | Top Educator 💥All Maths Chapters Complete & FREE 💥10+ Years Experience 💥Youtube: Maths Wallah 💥DPPs @ vineetloomba.com

U
Nice initiative.go on.bestwishes
GREAT WAY OF TEACHING
sir I think that their must be (6,7) in relation that you formed
Vineet Loomba
a year ago
7 doesnot belong to given set ...therefore we cannot include tht
but 6 is there na
1. BOARDS PREPARATIONS MADE EASY RELATIONS AND BINARY OPERATIONS CBSE AND STATE BOARDS CLASS 12 PREPARED BY: ER. VINEET LOOMBA IITIAN IIT-IEE MENTOr

2. 100% SUCCESS IN CLASS 12 BOARD EXAMS ABOUT ME B. Tech. From IIT Roorkee IIT-JEE Mentor Since 2010. Youtube, Founder @ vi neetloomba.com unacademy & Many of my students have scored 100/100 & Currently running my own Coaching Institute for JEE Main and Advanced Search vineet loomba unacadem "on G00GLE

3. BOARDS PREPARATIONS MADE EASY RELATIONS AND BINARY OPERATIONS CBSE AND STATE BOARDS CLASS 12 PREPARED BY: ER. VINEET LOOMBA IITIAN IIT-IEE MENTOr

4. 100% SUCCESS IN CLASS 12 BOARD EXAMS EXAMPLE: Check whether the relation R defined in the set {1, 2, 3, 4, 5, 6) as R-((a, b): b a+1 is reflexive, symmetric or transitive Symmetric or transitive R is not reflective, because (1,1) e R R is not symmetric because (1,2)e R but (2,1) R (1,2) e Rand (2,3) E R But (1,3) R Hence it is not transitive SUCCESS IN MATHEMATICS CLASS 12 BOARDS ER. VINEET LOOMBA (IIT ROORKEE)

5. 100% SUCCESS IN CLASS 12 BOARD EXAMS EXAMPLE: Let L be the set of all lines in Xy plane and R be the relation in L define as R = {(Li, L2): L1 ll L2} Show then R is on equivalence relation. Find the set of all lines related to the line Y=2x+4. We know the L1IL2 and L21IL3 Then L1|| L3 LIIL1 l.e (L1,L) ER Hence reflexive Lill L2 then L2 L i.e (LIL2)E R (L2L)e R Hence symmetric Hence Transitive. y = 2x +K When K is real number SUCCESS IN MATHEMATICS CLASS 12 BOARDS ER. VINEET LOOMBA (IIT ROORKEE)

6. 100% SUCCESS IN CLASS 12 BOARD EXAMS EXAMPLE: Show that the relation in the set R of real no. defined R [(a, b): as b3 ], is neither reflexive nor symmetric nor transitive. (i) (a, a) e R as asa' Which is false R is not reflexive. (ii) a sb' and bsa Which is false R is not symmetric. (ii) asb', bse' then asc4 Which is false SUCCESS IN MATHEMATICS CLASS 12 BOARDS ER. VINEET LOOMBA (IIT ROORKEE)

7. 100% SUCCESS IN CLASS 12 BOARD EXAMS EXAMPLE: Show that the relation R defined in the set A of all triangles as R = {(7,5) : Ti is similar to T is an equivalence relation. Consider three right angle triangles T with sides 3, 4, 5. T2 with sides 5, 12, 13 and T3 with sides 6, 8, 10. Which triangles among T , T2 and T3 are relations? (Ti,T2) e F T is similar to T2 and T2 is similar to T3 Tl is similar to T2 T2 is similar to T1 T1 is similar to Ta (T2, Ti) e R R is symmetric .'. R is transitive. Hence R is equivalence SUCCESS IN MATHEMATICS CLASS 12 BOARDS ER. VINEET LOOMBA (IIT ROORKEE)

8. 100% SUCCESS IN CLASS 12 BOARD EXAMS EXMPLELet A- {1,2,3,4). Let R be the equivalence relation on Ax A defined by Let A= {1, 2, 3,4. Let R be the equivalence relation on A A defined by ( a,b)R(c,d)iff a+d-b+c. Find the equivalence class (1,3 )] SUCCESS IN MATHEMATICS CLASS 12 BOARDS ER. VINEET LOOMBA (IIT ROORKEE)

9. 100% SUCCESS IN CLASS 12 BOARD EXAMS Save Save for this Course (Free) MOST IMPORTANT QUESTIONS IN MATHEMATICS Recommend Lessons (Like) TEE MAIN AND ADVANCED PREPARED ER. VINEET LOOMS . Rate and Review the Course MADE EASY 1ITIAN I IT-IEE MENTOR 00:00 05:46 SURE SHOT SUCCESS IN JEE MAIN AND ADVANCED CIIT-IEE) Comments ib 91 likes 18 comments Share HINDI Crash Course Maths Sharing with friends (Hindi) Most Important Questions in IIT-JEE Mathematics (Chapter- Wise) Vineet Loomba 11k Followers Follow 5.0 (51 ratings) Edit review SUCCESS IN MATHEMATICS CLASS 12 BOARDS ER. VINEET LOOMBA (IIT ROORKEE)