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JEE Main 202228 JuneMorning Shift
Exam
JEE Main
Year
2022
Date
28 June
Shift
Morning Shift
Subject
Mathematics
Chapter
Matrices

JEE Main 2022 · 28 June · Morning Shift · Mathematics · Matrices

Let A be a matrix of order 3 × 3 and det(A) = 2 . Then det(det ( A...

Let AbeamatrixoforderA be a matrix of order3 \times 3andanddet\left(A\right) = 2.Then. Thendet\left(det ( A ) adj \left(5 adj \left({A}^{3}\right)\right)\right) is equal to _____.

Options

  1. A256×106256 \times {10}^{6}
  2. B1024×1061024 \times {10}^{6}
  3. C512×106512 \times {10}^{6}
  4. D256×1011256 \times {10}^{11}

Correct answer

C. 512×106512 \times {10}^{6}

Step-by-step solution

(|(\operatorname{det}(A))adj⁡(\mathrm{A})) \operatorname{adj}(5 \operatorname{adj}(A))∣\mathrm{A}))|) (=\left|2 \operatorname{adj}\left(5 \operatorname{adj}\left(\mathrm{A}^3\right)\right)\right|) (=2^3 \mid \operatorname{adj}\left(5 \operatorname{adj}\left(\mathrm{A}^3\right) \|\right.) (=2^3\cdot\left|5 \operatorname{adj}\left(\mathrm{A}^3\right)\right|^2) (=2^3\left(5^3 \cdot\left|\operatorname{adj}\left(\mathrm{A}^3\right)\right|\right)^2) (=2^3 ⋅\cdot5^6 \cdot\left|\operatorname{adj} \mathrm{A}^3\right|^2) (=2^3 ⋅\cdot5^6\left(\left(|\mathrm{~A}|^3\right)^2\right)^2) (=2^3\cdot565^6\cdot212=2152^{12}=2^{15}\times56)(=295^6) (=2^9\times106)(=51210^6) (=512\times10^6)
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