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

माना \(\mathrm{A}=\{-4,-3,-2,0,1,3,4\}\) है तथा \(\mathrm{A}\) पर एक संबंध \(\mathrm{R}=\{(\mathrm{a}, \mathrm{b}) \in \mathrm{A} \times \mathrm{A}: \mathrm{b}=|\mathrm{a}|\) या \(\left.b^2=a+1\right\}\) है। तो संबंध \(R\) में कम से कम कितने अवयव जोड़े जाएं, जिससे कि यह स्वतुल्य तथा सममित हो जाए ?_______________.

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

Answer & Solution

Correct Answer

(B) \(7\)

Step-by-step Solution

Detailed explanation

\(R=[(-4,4),(-3,3),(3,-2),(0,1),(0,0),(1,1)\), \((4,4),(3,3)\}\) For reflexive, add \(\Rightarrow(-2,-2),(-4,-4),(-3,-3)\) For symmetric, add \(\Rightarrow(4,-4),(3,-3),(-2,3),(1,0)\)
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