Let R be the relation in the set N given by R = {(a, b) : a = b – 2, b > 6}, then:

(a) (2, 4) ∈ R               (b) (3, 8) ∈ R

(c) (6, 8) ∈ R               (d) (8, 7) ∈ R

 

This question is inspired from Ex 1.1, 16 (MCQ) - Chapter 1 Class 12 - Relation and Functions

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Question 30 Let R be the relation in the set N given by R = {(a, b) : a = b – 2, b > 6}, then: (a) (2, 4) ∈ R (b) (3, 8) ∈ R (c) (6, 8) ∈ R (d) (8, 7) ∈ R R = {(a, b): a = b − 2, b > 6} Here (a, b) to be in relation a = b – 2 b > 6 Both conditions should be satisfied Checking options Option A (2, 4) ∴ a = 2 , b = 4 Here a = b – 2, as 2 = 4 – 2 But b should be greater than 6 Hence, option A is not correct Option B (3, 8) ∴ a = 3 , b = 8 But a ≠ b – 2 as 3 ≠ 8 – 2 Hence, option B is not correct Option C (6, 8) ∴ a = 6 , b = 8 Here a = b – 2 , as 6 = 8 – 2 & b > 6, ∴ (6, 8) ∈ R Hence, option C is correct Option D (8, 7) ∴ a = 8 , b = 7 But a ≠ b – 2 as 8 ≠ 7 – 2 Hence, option D is not correct

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.