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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

माना समीकरण निकाय \(x+y+\alpha z=2\) \(3 x+y+z=4\) \(x+2 z=1\) का अद्वितीय हल \(\left( x ^*, y ^*, z ^*\right)\) है यदि \(\left(\alpha, x ^*\right)\), \(\left( y ^*, \alpha\right)\) तथा \(\left( x ^*,- y ^*\right)\) संरेखीय बिन्दु हो, तो \(\alpha\) की सभी संभव मानों का निरपेक्ष मान होगा :

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

Answer & Solution

Correct Answer

(C) \(2\)

Step-by-step Solution

Detailed explanation

\(\Delta=\left|\begin{array}{lll}1 & 1 & \alpha \\ 3 & 1 & 1 \\ 1 & 0 & 2\end{array}\right|=-(\alpha+3)\) \(\Delta_{1}=\left|\begin{array}{lll}2 & 1 & \alpha \\ 4 & 1 & 1 \\ 1 & 0 & 2\end{array}\right|=-(3+\alpha)\)…
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