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

यदि \(P =\left[\begin{array}{lll}1 & \alpha & 3 \\ 1 & 3 & 3 \\ 2 & 4 & 4\end{array}\right] 3 \times 3\) आव्यूह \(A\) का सहखण्डज है और \(| A |=4\) तो \(\alpha\) का मान है

  1. A \(4\)
  2. B \(11\)
  3. C \(5\)
  4. D \(0\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(11\)

Step-by-step Solution

Detailed explanation

\(|P|=1(12-12)-\alpha(4-6)+3(4-6)\) \(=2 \alpha-6\) \(|P|=|A|^{2}=16\) \(2 \alpha-6=16\) \(\alpha=11.\)
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