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

\(\alpha\) के लिए वह मान, जिनके लिए \(\left|\begin{array}{ccc}1 & \frac{3}{2} & \alpha+\frac{3}{2} \\ 1 & \frac{1}{3} & \alpha+\frac{1}{3} \\ 2 \alpha+3 & 3 \alpha+1 & 0\end{array}\right|=0\) है, किस अंतराल में है ?

  1. A  \((-2,1)\)
  2. B  \((-3,0)\)
  3. C  \(\left(-\frac{3}{2}, \frac{3}{2}\right)\)
  4. D  \((0,3)\)
Verified Solution

Answer & Solution

Correct Answer

(B)  \((-3,0)\)

Step-by-step Solution

Detailed explanation

\(\left|\begin{array}{ccc}1 & \frac{3}{2} & \alpha+\frac{3}{2} \\ 1 & \frac{1}{3} & \alpha+\frac{1}{3} \\ 2 \alpha+3 & 3 \alpha+1 & 0\end{array}\right|=0\) \( \Rightarrow(2 \alpha+3)\left\{\frac{7 \alpha}{6}\right\}-(3 \alpha+1)\left\{\frac{-7}{6}\right\}=0 \)…
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