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

ધારો કે \(A\) એ 3 કક્ષાનો ચોરસ શ્રેણિક છે જેથી \(\operatorname{det}(A)=-2\) અને \(\operatorname{det}(3 \operatorname{adj}(-6 \operatorname{adj}(3 A)))=2^{\mathrm{m}+\mathrm{n}} \cdot 3^{\mathrm{mn}}, \mathrm{m}\gt\mathrm{n}\). તો \(4 \mathrm{~m}+2 \mathrm{n}\) = ___

  1. A 30
  2. B 32
  3. C 36
  4. D 34
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Correct Answer

(D) 34

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\begin{aligned} & \text { As } A \operatorname{adj} A=|A| l, \operatorname{det}(\lambda A)=\lambda^n \operatorname{det} A \\ & \operatorname{det}(3 \operatorname{adj}(-6 \operatorname{adj}(3 A)))=3^3 \operatorname{det}(\operatorname{adj}(-6 \operatorname{adj}(3 A))) \\ & =3^3(-6…

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