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

જો \(A\) એ \(3\times3\) શ્રેણિક છે કે જેથી \(\left| {5.adjA} \right| = 5\), તો \(\left| A \right|\) ની કિમંત મેળવો.

  1. A \( \pm \frac{1}{5}\)
  2. B \( \pm \frac{1}{25}\)
  3. C \( \pm 1\)
  4. D \( \pm 5\)
Verified Solution

Answer & Solution

Correct Answer

(A) \( \pm \frac{1}{5}\)

Step-by-step Solution

Detailed explanation

\(\left| {5\,.adj\,A} \right| = 5 \Rightarrow {5^3}.{\left| A \right|^{3 - 1}} = 5\) \( \Rightarrow 125{\left| A \right|^2} = 5 \Rightarrow \left| A \right| = \pm \frac{1}{5}\)
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