Similarly, {x, y} ∈ R2 ⇒ {x, y}
Rationalised 2023-24
MATHEMATICS
14
⊂ {1, 4, 7} or {x, y} ⊂ {2, 5, 8} or  {x, y} ⊂ {3, 6, 9} ⇒ x – y is divisible by
3 ⇒ {x, y} ∈ R1 This shows that R2 ⊂ R1 Hence, R1 = R2 Example 21 Let f : X → Y be a function