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

माना \(A=\{1,2,3,4, \ldots . .10\}\) और \(B=\{0,1,2,3,4\}\) हैं। संबंध \(\mathrm{R}=\left\{(\mathrm{a}, \mathrm{b}) \in \mathrm{A} \times \mathrm{A}: 2(\mathrm{a}-\mathrm{b})^2+\right.\) \(3(\mathrm{a}-\mathrm{b}) \in \mathrm{B}\}\) में अवयवों की संख्या है______________

  1. A \(12\)
  2. B \(14\)
  3. C \(16\)
  4. D \(18\)
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Answer & Solution

Correct Answer

(D) \(18\)

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Detailed explanation

\(A=\{1,2,3, \ldots \ldots 10\}\) \(B=\{0,1,2,3,4\}\) \(R=\left\{(a, b) \in A \times A: 2(a-b)^2+3(a-b) \in B\right\}\) \(\text { Now } 2(a-b)^2+3(a-b)=(a-b)(2(a-b)+3)\) \(\Rightarrow a=b \text { or } a-b=-2\) Now \(2(a-b)^2+3(a-b)=(a-b)(2(a-b)+3)\)…
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