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

समुच्चय \(\{1,2,3,4\}\) पर परिभाषित ऐसे संबंधों, जो सममित हैं, पर स्वतुल्य नहीं हैं, की संख्या ........... है।

  1. A \(950\)
  2. B \(940\)
  3. C \(960\)
  4. D \(965\)
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Answer & Solution

Correct Answer

(C) \(960\)

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Detailed explanation

Total number of relation both symmetric and reflexive \(=2^{\frac{\mathrm{n}^2-\mathrm{n}}{2}}\) Total number of symmetric relation \(=2^{\left(\frac{\mathrm{n}^2+\mathrm{n}}{2}\right)}\) \(\Rightarrow\) Then number of symmetric relation which are not reflexive \( \Rightarrow \)…
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