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

સમીકરણ સહતિ  \(x+y+z=\alpha\)  ; \(\alpha x+2 \alpha y+3 z=-1\)  ;   \(x+3 \alpha y+5 z=4\)    સુસંગત થાય તેવી \(\alpha\) ની કિંમતોની સંખ્યા ............ છે.

  1. A \(0\)
  2. B \(1\)
  3. C \(2\)
  4. D \(3\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(1\)

Step-by-step Solution

Detailed explanation

\(x+y+z=\alpha\) \(\alpha x+2 \alpha y+3 z=-1\) \(x+3 \alpha y+5 z=4\) Has inconsistent solution \(D =\left|\begin{array}{ccc}1 & 1 & 1 \\ \alpha & 2 \alpha & 3 \\ 1 & 3 \alpha & 5\end{array}\right|=0\) \(\Rightarrow(\alpha-1)^{2}=0\) \(\alpha=1\) For \(\alpha=1\)…
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