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

यदि वास्तविक संख्याओं \(\alpha\) तथा \(\beta\) के लिए रैखिक समीकरण निकाय : \(x + y - z =2, x +2 y +\alpha z =1,2 x - y + z =\beta\) के अनंत हल हैं, तो \(\alpha+\beta\) बराबर है ।

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

Answer & Solution

Correct Answer

(B) \(5\)

Step-by-step Solution

Detailed explanation

For infinite solutions \(\Delta=\Delta_{1}=\Delta_{2}=\Delta_{3}=0\) \(\Delta=\left|\begin{array}{ccc}1 & 1 & -1 \\ 1 & 2 & \alpha \\ 2 & -1 & 1\end{array}\right|=0\) \(\Delta=\left|\begin{array}{ccc}3 & 0 & 0 \\ 1 & 2 & \alpha \\ 2 & -1 & 1\end{array}\right|=0\)…
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