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

જો \(P = \left[ {\begin{array}{*{20}{c}}1&\alpha &3\\1&3&3\\2&4&4\end{array}} \right]\) એ \(3×3 \) શ્રેણિક \(A\)  નો સહઅવયવજ હોય અને \( |A|=4\)  તો \(\alpha \) મેળવો.

  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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