If A= [ array lll 1 & 2 & 3 0 & 3 & 1 2 & 1 & 2 array ] , then A (adj A) equals -

Mathematics · JEE Main · NTA Exams — Matrices and Determinants

1. \[\left[\begin{array}{lll} 9 & 0 & 0 \\ 0 & 9 & 0 \\ 0 & 0 & 9 \end{array}\right]\]
2. \[-\left[\begin{array}{lll} 9 & 0 & 0 \\ 0 & 9 & 0 \\ 0 & 0 & 9 \end{array}\right]\]
3. \[\left[\begin{array}{lll} 0 & 0 & 9 \\ 0 & 9 & 0 \\ 9 & 0 & 0 \end{array}\right]\]
4. none of these

Answer

(B) - [ array lll 9 & 0 & 0 0 & 9 & 0 0 & 0 & 9 array ]

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