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JEE Mains · Maths · STD 11 - 9. straight line

माना \(\alpha, \beta, \gamma, \delta \in \mathrm{Z}\) हैं तथा माना एक समांतर चतुर्भज \(\mathrm{ABCD}\) के शीर्ष \(\mathrm{A}(\alpha, \beta), \mathrm{B}(1,0), \mathrm{C}(\gamma, \delta)\) तथा \(\mathrm{D}(1,2)\) हैं। यदि \(\mathrm{AB}=\sqrt{10}\) है तथा बिन्दु \(\mathrm{A}\) और \(\mathrm{C}\), रेखा \(3 \mathrm{y}=2 \mathrm{x}+1\) पर है, तो \(2(\alpha+\beta+\gamma+\delta)\) = ...........

  1. A \(10\)
  2. B \(5\)
  3. C \(12\)
  4. D \(8\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(8\)

Step-by-step Solution

Detailed explanation

Let \(\mathrm{E}\) is mid point of diagonals \(\begin{array}{ll}\frac{\alpha+\gamma}{2}=\frac{1+1}{2} & \& \frac{\beta+\delta}{2}=\frac{2+0}{2} \\ \alpha+\gamma=2 & \beta+\delta=2 \\ 2(\alpha+\beta+\gamma+\delta)=2(2+2)=8\end{array}\)
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