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

यदि \(\mathrm{P}\) एक \(3 \times 3\) का वास्तविक आव्यूह इस प्रकार है कि \(\mathrm{P}^{\mathrm{T}}=\mathrm{aP}+(\mathrm{a}-1) \mathrm{I}\) है, जहाँ \(\mathrm{a}>1\) है, तब :

  1. A \(P\) एक अव्युत्क्रमणीय आव्यूह है।
  2. B \(|\operatorname{Adj} P|>1\)
  3. C \(|\operatorname{Adj} P|=\frac{1}{2}\)
  4. D \(|\operatorname{Adj} P|=1\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(|\operatorname{Adj} P|=1\)

Step-by-step Solution

Detailed explanation

\(P ^{ T }= aP +( a -1) I\) \(\Rightarrow P = aP ^{ T }+( a -1) I\) \(\Rightarrow P ^{ T }- P = a \left( P - P ^{ T }\right)\) \(\Rightarrow P = P ^{ T } \text {, as } a \neq-1\) \(\text { Now, } P = aP +( a -1) I\) \(\Rightarrow P =- I \Rightarrow| P |=1\)…
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