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JEE Mains · Maths · STD 12 - 1. relation and function

समुच्चय \(\{1,2,3\}\) पर अरिक्त तुल्यता संबंधों की संख्या ___ है।

  1. A \(6\)
  2. B \(5\)
  3. C \(7\)
  4. D \(4\)
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Answer & Solution

Correct Answer

(B) \(5\)

Step-by-step Solution

Detailed explanation

Let \(R\) be the required relation \(\mathrm{A}=\{(1,1)(2,2),(3,3)\}\) (i) \(|\mathrm{R}|=3\), when \(\mathrm{R}=\mathrm{A}\) (ii) \(|\mathrm{R}|=5\), e.g. \(\mathrm{R}=\mathrm{A} \cup\{(1,2),(2,1)\}\) Number of \(R\) can be [3] (iii) \(\mathrm{R}=\{1,2,3\} \times\{1,2,3\}\)…
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