JEE Previous Year Question
Let ={(a,b) NxN:|a-b|13}and
={(a,b) NxN: |a-b|13}. Then on N:
Topic: JEE PYQ
Answer: B. Full step-by-step solution below.
- ABoth and are equivalence relations
- BNeither nor is an equivalence relation
- C is an equivalence relation but is not
- D is an equivalence relation but is not
Correct answer: B
Solution
(b) {(a,b) NxN: |a-b|13}R2={(a,b) NxN:|a-b|13}.
For :
(i) Reflexive relation
(a,a) NxN: |a-a|13
(ii) Symmetric relation
(iii) Transitive relation
but
For R2:
(i) Reflexive relation
(a,a) NxN:|a-a|13
(ii) Symmetric relation
(b,a) NxN:|b-a|13
(iii) Transitive relation
(a,b) R2,(b,c) R2,(a,c) R2
(1, 3) R2, (3, 14) R2 but (1, 14) R2